shortcuts

src/App.tsx

@@ -6,6 +6,7 @@ const IMAGE_FOLDER_KEY = "kml_map_tool.image_folder";
 const POPUP_SIZE_KEY = "kml_map_tool.popup_size";
 const POPUP_ENABLED_KEY = "kml_map_tool.popup_enabled";
 const BBOX_MODE_KEY = "kml_map_tool.bbox_mode";
+const BBOX_OVERLAY_KEY = "kml_map_tool.bbox_overlay";
 const POPUP_ASPECT_KEY = "kml_map_tool.popup_aspect";
 const QUALITY_OFF_TRACK_KEY = "kml_map_tool.quality_off_track_m";
 const PERF_MODE_KEY = "kml_map_tool.perf_mode";
@@ -311,6 +312,16 @@ function AppShell({
   useEffect(() => {
     window.localStorage.setItem(BBOX_MODE_KEY, bboxMode ? "1" : "0");
   }, [bboxMode]);
+  // Independent of edit mode — whether the bbox rectangle/label is shown on
+  // the popup image at all. Default ON so users see annotations immediately.
+  const [bboxOverlay, setBboxOverlay] = useState<boolean>(() => {
+    if (typeof window === "undefined") return true;
+    const v = window.localStorage.getItem(BBOX_OVERLAY_KEY);
+    return v === null ? true : v === "1";
+  });
+  useEffect(() => {
+    window.localStorage.setItem(BBOX_OVERLAY_KEY, bboxOverlay ? "1" : "0");
+  }, [bboxOverlay]);
   const [popupAspect, setPopupAspect] = useState<PopupAspect>(() => {
     if (typeof window === "undefined") return "4:3";
     const v = window.localStorage.getItem(POPUP_ASPECT_KEY) as PopupAspect | null;
@@ -573,6 +584,21 @@ function AppShell({
     null | { ids: number[]; current: string }
   >(null);
   const [renameInput, setRenameInput] = useState<string>("");
+  // Auto-dismissing toast for transient confirmations (delete, rename, side
+  // flip). Separate from the persistent status bar at the top — toasts
+  // float at the bottom and disappear after ~2s.
+  const [toast, setToast] = useState<string | null>(null);
+  const toastTimerRef = useRef<number | null>(null);
+  const showToast = (text: string) => {
+    setToast(text);
+    if (toastTimerRef.current !== null) {
+      window.clearTimeout(toastTimerRef.current);
+    }
+    toastTimerRef.current = window.setTimeout(() => {
+      setToast(null);
+      toastTimerRef.current = null;
+    }, 2200);
+  };
   const [osmToolsOpen, setOsmToolsOpen] = useState<boolean>(false);
   const [importsOpen, setImportsOpen] = useState<boolean>(false);
   const [osmToolPrune, setOsmToolPrune] = useState<boolean>(true);
@@ -994,9 +1020,11 @@ function AppShell({
     try {
       await invoke("update_asset_position", { id, vertex, lat, lng });
       setStatus(`Moved ${vertex} to ${lat.toFixed(6)}, ${lng.toFixed(6)}`);
+      showToast(`Moved ${vertex} point`);
       await refreshAfterMutation();
     } catch (e) {
       setStatus(`Move failed: ${e}`);
+      showToast(`Move failed`);
     }
   }
 
@@ -1123,6 +1151,63 @@ function AppShell({
         toggleOsmEditModeRef.current();
         return;
       }
+      // 'R' / 'r' opens the rename modal for the currently selected asset.
+      // Input-guard pattern matches the other shortcuts.
+      if (e.key === "r" || e.key === "R") {
+        const target = e.target as HTMLElement | null;
+        const tag = target?.tagName;
+        if (tag === "INPUT" || tag === "TEXTAREA" || target?.isContentEditable) {
+          return;
+        }
+        if (e.metaKey || e.ctrlKey || e.altKey) return;
+        if (!selectedAsset) return;
+        e.preventDefault();
+        setRenameOpen({
+          ids: [selectedAsset.id],
+          current: selectedAsset.asset_name ?? "",
+        });
+        setRenameInput(selectedAsset.asset_name ?? "");
+        return;
+      }
+      // Delete / Backspace: when an asset is selected and we're not in any
+      // edit mode that already claims those keys (OSM vertex/road delete,
+      // link deletion handled above), delete the asset and toast.
+      if (
+        (e.key === "Delete" || e.key === "Backspace") &&
+        selectedAsset &&
+        !osmEditMode &&
+        !selectedLink
+      ) {
+        const target = e.target as HTMLElement | null;
+        const tag = target?.tagName;
+        if (tag === "INPUT" || tag === "TEXTAREA" || target?.isContentEditable) {
+          return;
+        }
+        e.preventDefault();
+        const label = `${selectedAsset.asset_name} · ${selectedAsset.row_id}`;
+        (async () => {
+          try {
+            await invoke("delete_asset", { id: selectedAsset.id });
+            setSelectedAssetId(null);
+            // Surgical local update — drop the row instead of refetching
+            // everything, so the rest of the UI stays put.
+            const deletedId = selectedAsset.id;
+            setAssets((prev) =>
+              prev.map((a) =>
+                a.id === deletedId ? { ...a, deleted: 1 } : a,
+              ),
+            );
+            showToast(`Deleted ${label}`);
+            void Promise.all([
+              refreshActions().catch(() => {}),
+              refreshDataCounts().catch(() => {}),
+            ]);
+          } catch (err) {
+            showToast(`Delete failed: ${err}`);
+          }
+        })();
+        return;
+      }
       // 'B' / 'b' toggles bbox editing. No-op when popups are disabled.
       if (e.key === "b" || e.key === "B") {
         const target = e.target as HTMLElement | null;
@@ -1209,7 +1294,7 @@ function AppShell({
     };
     window.addEventListener("keydown", handler);
     return () => window.removeEventListener("keydown", handler);
-  }, [drawRoadMode, editingRoadId, linkPickMode, rightClickFirstId, lassoMode, selectedLink, selectedMetadataVideo, gotoPin, osmEditMode, markedVertices, focusedVideo, selectedRoadIds, lensActive]);
+  }, [drawRoadMode, editingRoadId, linkPickMode, rightClickFirstId, lassoMode, selectedLink, selectedMetadataVideo, gotoPin, osmEditMode, markedVertices, focusedVideo, selectedRoadIds, lensActive, selectedAsset, popupEnabled]);
 
   // Image prefetch: when an asset is selected, warm the browser cache for its
   // immediate neighbours so [/] navigation feels instant.
@@ -1309,15 +1394,39 @@ function AppShell({
     return () => window.removeEventListener("keydown", handler);
   }, [selectedAsset, viewport.center]);
 
+  // Set an asset's side. Used both by the popup flip button and the auto-flip
+  // from bbox editing (when the bbox center is in the left vs right half of
+  // the image). Updates the local assets array in place so the popup tag
+  // and any downstream UI refresh without a full re-fetch.
+  async function handleSideChange(assetId: number, side: "Left" | "Right") {
+    const cur = assets.find((a) => a.id === assetId);
+    if (cur && cur.side === side) return;
+    try {
+      await invoke<number>("change_assets_side", {
+        ids: [assetId],
+        side,
+      });
+      setAssets((prev) =>
+        prev.map((a) => (a.id === assetId ? { ...a, side } : a)),
+      );
+      showToast(`Side → ${side}`);
+    } catch (e) {
+      showToast(`Side change failed: ${e}`);
+    }
+  }
+
   async function handleDeleteSelected() {
     if (!selectedAsset) return;
+    const label = `${selectedAsset.asset_name} · ${selectedAsset.row_id}`;
     try {
       await invoke("delete_asset", { id: selectedAsset.id });
-      setStatus(`Deleted ${selectedAsset.asset_name} · ${selectedAsset.row_id}`);
+      setStatus(`Deleted ${label}`);
+      showToast(`Deleted ${label}`);
       setSelectedAssetId(null);
       await refreshAfterMutation();
     } catch (e) {
       setStatus(`Delete failed: ${e}`);
+      showToast(`Delete failed: ${e}`);
     }
   }
 
@@ -1345,13 +1454,16 @@ function AppShell({
       });
       if (count === 0) {
         setStatus(`No live assets matched video "${name}"`);
+        showToast(`No matches for "${name}"`);
       } else {
         setStatus(`Deleted ${count} assets from video "${name}"`);
+        showToast(`Deleted ${count} assets in "${name}"`);
         setBulkVideoName("");
       }
       await refreshAfterMutation();
     } catch (e) {
       setStatus(`Bulk delete failed: ${e}`);
+      showToast(`Bulk delete failed`);
     }
   }
 
@@ -1406,8 +1518,10 @@ function AppShell({
         refreshAssetNames().catch(() => {}),
       ]);
       setStatus("Database reset.");
+      showToast("Database reset");
     } catch (e) {
       setStatus(`Reset failed: ${e}`);
+      showToast(`Reset failed`);
     } finally {
       setBusy(false);
     }
@@ -1417,9 +1531,11 @@ function AppShell({
     try {
       await invoke("undo_action", { actionId });
       setStatus(`Undone action #${actionId}`);
+      showToast(`Undone #${actionId}`);
       await refreshAfterMutation();
     } catch (e) {
       setStatus(`Undo failed: ${e}`);
+      showToast(`Undo failed`);
     }
   }
 
@@ -1427,9 +1543,11 @@ function AppShell({
     try {
       await invoke("redo_action", { actionId });
       setStatus(`Redone action #${actionId}`);
+      showToast(`Redone #${actionId}`);
       await refreshAfterMutation();
     } catch (e) {
       setStatus(`Redo failed: ${e}`);
+      showToast(`Redo failed`);
     }
   }
 
@@ -1460,12 +1578,16 @@ function AppShell({
       setStatus(
         `Merged ${mergeSecondary.row_id} into ${mergePrimary.row_id}`,
       );
+      showToast(
+        `Merged ${mergeSecondary.row_id} → ${mergePrimary.row_id}`,
+      );
       setMergePrimary(null);
       setMergeSecondary(null);
       setSelectedAssetId(null);
       await refreshAfterMutation();
     } catch (e) {
       setStatus(`Merge failed: ${e}`);
+      showToast(`Merge failed`);
     }
   }
 
@@ -1917,8 +2039,10 @@ function AppShell({
       setStatus(
         `Created road #${newId} with ${drawRoadCoords.length} vertices.`,
       );
+      showToast(`Created road #${newId}`);
     } catch (e) {
       setStatus(`Create road failed: ${e}`);
+      showToast(`Create road failed`);
     }
   }
 
@@ -1926,14 +2050,17 @@ function AppShell({
     if (editingRoadId === null) return;
     const ok = window.confirm(`Delete road #${editingRoadId}?`);
     if (!ok) return;
+    const roadId = editingRoadId;
     try {
-      await invoke("delete_osm_road", { id: editingRoadId });
+      await invoke("delete_osm_road", { id: roadId });
       await refreshOsmRoads();
       await refreshDataCounts();
       setEditingRoadId(null);
-      setStatus(`Deleted road #${editingRoadId}.`);
+      setStatus(`Deleted road #${roadId}.`);
+      showToast(`Deleted road #${roadId}`);
     } catch (e) {
       setStatus(`Delete failed: ${e}`);
+      showToast(`Delete road failed`);
     }
   }
 
@@ -2021,9 +2148,11 @@ function AppShell({
         );
       } else {
         setStatus(`Loaded ${count} road segment(s)`);
+        showToast(`Loaded ${count} road segment(s)`);
       }
     } catch (e) {
       setStatus(`OSM import failed: ${e}`);
+      showToast(`OSM import failed`);
     } finally {
       setBusy(false);
     }
@@ -3057,8 +3186,10 @@ function AppShell({
         await fetchBboxAssets(boundsRef.current);
       }
       setStatus(`Loaded ${count} scope polygon(s)`);
+      showToast(`Loaded ${count} scope polygon(s)`);
     } catch (e) {
       setStatus(`KML import failed: ${e}`);
+      showToast(`KML import failed`);
     } finally {
       setBusy(false);
     }
@@ -3146,6 +3277,7 @@ function AppShell({
         { path: picked },
       );
       setStatus(`Imported ${r.fixed} fixed + ${r.range} range = ${r.fixed + r.range} asset(s)`);
+      showToast(`Imported ${r.fixed + r.range} asset(s)`);
       await Promise.all([
         refreshVideoNames(),
         refreshVideoEntries(),
@@ -3189,6 +3321,7 @@ function AppShell({
         kind === "fixed" ? "import_fixed_assets" : "import_range_assets";
       const count = await invoke<number>(cmd, { path: picked });
       setStatus(`Imported ${count} ${kind}`);
+      showToast(`Imported ${count} ${kind} asset(s)`);
 
       // Pull in the new video / class names so the filter auto-includes them.
       await Promise.all([
@@ -3428,6 +3561,8 @@ function AppShell({
           imageFolder={imageFolder}
           popupEnabled={popupEnabled}
           bboxMode={bboxMode}
+          bboxOverlay={bboxOverlay}
+          onSideChange={handleSideChange}
           perfMode={perfMode}
           anchorIds={Array.from(anchors.keys())}
           colorBy={colorBy}
@@ -3551,6 +3686,8 @@ function AppShell({
             imageFolder={imageFolder}
           popupEnabled={popupEnabled}
           bboxMode={bboxMode}
+          bboxOverlay={bboxOverlay}
+          onSideChange={handleSideChange}
           perfMode={perfMode}
           anchorIds={Array.from(anchors.keys())}
             colorBy={
@@ -3653,6 +3790,31 @@ function AppShell({
         </button>
       </div>
 
+      {toast !== null && (
+        <div
+          // Bottom-center transient confirmation. Fixed position so it
+          // overlays everything; pointerEvents:none so it never blocks
+          // clicks on whatever's behind it.
+          style={{
+            position: "fixed",
+            left: "50%",
+            bottom: 24,
+            transform: "translateX(-50%)",
+            zIndex: 9999,
+            background: "rgba(44, 62, 80, 0.95)",
+            color: "#fff",
+            padding: "8px 16px",
+            borderRadius: 6,
+            fontSize: 13,
+            fontWeight: 600,
+            boxShadow: "0 4px 12px rgba(0,0,0,0.35)",
+            pointerEvents: "none",
+          }}
+        >
+          {toast}
+        </div>
+      )}
+
       <button
         className="panel-toggle"
         onClick={() => setPanelOpen((v) => !v)}
@@ -4152,7 +4314,8 @@ function AppShell({
                   const name = renameInput.trim();
                   if (!name) return;
                   try {
-                    if (!classNames.includes(name)) {
+                    const isNewClass = !classNames.includes(name);
+                    if (isNewClass) {
                       await invoke("add_class", { name });
                     }
                     await invoke<number>("rename_assets", {
@@ -4162,9 +4325,35 @@ function AppShell({
                     setStatus(
                       `Renamed ${renameOpen.ids.length} asset(s) → ${name}`,
                     );
+                    showToast(
+                      renameOpen.ids.length === 1
+                        ? `Renamed → ${name}`
+                        : `Renamed ${renameOpen.ids.length} → ${name}`,
+                    );
                     setRenameOpen(null);
                     setRenameInput("");
-                    await refreshAfterMutation();
+                    // Surgical update so scroll position / selection / list
+                    // panels don't churn: just patch asset_name on the renamed
+                    // rows in the existing array, and append the new class
+                    // locally if there is one. The audit log / counts / video
+                    // panels are refreshed in the background — they don't
+                    // affect the user's place in the UI.
+                    const renamedIds = new Set(renameOpen.ids);
+                    setAssets((prev) =>
+                      prev.map((a) =>
+                        renamedIds.has(a.id) ? { ...a, asset_name: name } : a,
+                      ),
+                    );
+                    if (isNewClass) {
+                      setClassNames((prev) =>
+                        prev.includes(name) ? prev : [...prev, name].sort(),
+                      );
+                    }
+                    void Promise.all([
+                      refreshActions().catch(() => {}),
+                      refreshAssetNames().catch(() => {}),
+                      refreshDataCounts().catch(() => {}),
+                    ]);
                   } catch (e) {
                     setStatus(`Rename failed: ${e}`);
                   }
@@ -4423,6 +4612,23 @@ function AppShell({
               />
               Show image popup when an asset is selected
             </label>
+            <label
+              style={{
+                display: "flex",
+                alignItems: "center",
+                gap: 6,
+                marginTop: 6,
+              }}
+              title="Render the saved bounding box on top of the image. Read-only by itself — flip BBox mode below to edit."
+            >
+              <input
+                type="checkbox"
+                checked={bboxOverlay}
+                onChange={(e) => setBboxOverlay(e.target.checked)}
+                disabled={!popupEnabled}
+              />
+              Show bbox overlay on images
+            </label>
             <label
               style={{
                 display: "flex",
@@ -4436,7 +4642,7 @@ function AppShell({
                 type="checkbox"
                 checked={bboxMode}
                 onChange={(e) => setBboxMode(e.target.checked)}
-                disabled={!popupEnabled}
+                disabled={!popupEnabled || !bboxOverlay}
               />
               BBox mode (edit bounding boxes on images)
             </label>

src/MapView.tsx

@@ -74,6 +74,8 @@ type Props = {
   onMetadataLineClick?: (videoName: string) => void;
   popupEnabled?: boolean;
   bboxMode?: boolean;
+  bboxOverlay?: boolean;
+  onSideChange?: (assetId: number, side: "Left" | "Right") => void;
   perfMode?: boolean;
   onPositionChange?: (id: number, vertex: Vertex, lat: number, lng: number) => void;
   placeMode?: boolean;
@@ -147,6 +149,8 @@ export function MapView({
   onMetadataLineClick,
   popupEnabled = true,
   bboxMode = false,
+  bboxOverlay = true,
+  onSideChange,
   perfMode = false,
   onPositionChange,
   placeMode = false,
@@ -202,6 +206,8 @@ export function MapView({
   osmEditModeRef.current = osmEditMode;
   const onPickRoadRef = useRef(onPickRoad);
   onPickRoadRef.current = onPickRoad;
+  const onSideChangeRef = useRef(onSideChange);
+  onSideChangeRef.current = onSideChange;
   const onUpdateRoadRef = useRef(onUpdateRoad);
   onUpdateRoadRef.current = onUpdateRoad;
   const onRoadRightClickRef = useRef(onRoadRightClick);
@@ -1648,6 +1654,7 @@ export function MapView({
       img: HTMLImageElement,
       asset: Asset,
       slot: BboxSlot,
+      editable: boolean,
     ) {
       const SVG_NS = "http://www.w3.org/2000/svg";
       let svg: SVGSVGElement | null = null;
@@ -1670,9 +1677,13 @@ export function MapView({
         if (!natW || !natH) return;
 
         // Pull the popup's fixed image size off the CSS variable so the
-        // wrapper becomes a fixed-size scrollable viewport. The image is
-        // resized below to its "contain" fit at zoom = 1; wheel zoom grows it
-        // beyond the wrapper, triggering scrollbars.
+        // wrapper becomes a fixed-size scrollable viewport. Inside, both the
+        // image and the SVG render at the same CSS box; the image stays
+        // contain-fit so it never distorts, and the SVG's viewBox +
+        // preserveAspectRatio="xMidYMid meet" makes its coordinate space line
+        // up with the displayed image automatically — so a bbox at native
+        // pixel (138, 1725) renders exactly on top of pixel (138, 1725) in
+        // the image, including any letterbox padding when aspects differ.
         const css = getComputedStyle(document.documentElement);
         const baseW =
           parseInt(css.getPropertyValue("--popup-img-w") || "440", 10) || 440;
@@ -1683,38 +1694,38 @@ export function MapView({
         wrapper.style.maxWidth = `${baseW}px`;
         wrapper.style.maxHeight = `${baseH}px`;
         wrapper.style.overflow = "auto";
-        // Compute the contain-fit size at zoom = 1.
-        const aspect = natW / natH;
-        const fitW =
-          baseW / baseH > aspect ? baseH * aspect : baseW;
-        const fitH =
-          baseW / baseH > aspect ? baseH : baseW / aspect;
 
-        // The image and overlay need to scale together; both are sized in CSS
-        // pixels off the same zoom factor.
-        img.style.objectFit = "fill";
-        img.style.width = `${fitW}px`;
-        img.style.height = `${fitH}px`;
+        img.style.objectFit = "contain";
+        img.style.objectPosition = "left top";
+        img.style.width = `${baseW}px`;
+        img.style.height = `${baseH}px`;
         img.style.display = "block";
 
         svg = document.createElementNS(SVG_NS, "svg") as SVGSVGElement;
         svg.setAttribute("viewBox", `0 0 ${natW} ${natH}`);
-        svg.setAttribute("preserveAspectRatio", "none");
+        svg.setAttribute("preserveAspectRatio", "xMinYMin meet");
         svg.style.position = "absolute";
         svg.style.left = "0";
         svg.style.top = "0";
-        svg.style.width = `${fitW}px`;
-        svg.style.height = `${fitH}px`;
-        svg.style.cursor = "crosshair";
+        svg.style.width = `${baseW}px`;
+        svg.style.height = `${baseH}px`;
+        svg.style.cursor = editable ? "crosshair" : "default";
         svg.style.touchAction = "none";
+        // In read-only mode the overlay must not intercept clicks — the map
+        // popup needs to stay closeable via its X button and clicks on the
+        // image should not start a draw.
+        if (!editable) {
+          svg.style.pointerEvents = "none";
+        }
         wrapper.appendChild(svg);
 
         // Zoom state — wheel anchored on the cursor. Bounded so the user
-        // can't accidentally zoom to a useless extreme.
+        // can't accidentally zoom to a useless extreme. Both img and svg
+        // grow uniformly so the contain-fit overlay stays aligned.
         let zoom = 1;
         const applyZoom = () => {
-          const w = fitW * zoom;
-          const h = fitH * zoom;
+          const w = baseW * zoom;
+          const h = baseH * zoom;
           img.style.width = `${w}px`;
           img.style.height = `${h}px`;
           if (svg) {
@@ -1797,15 +1808,22 @@ export function MapView({
         labelText = null;
         handles = [];
         if (!bbox) {
-          // Hint that the user can drag to draw a bbox.
+          // Either editable (drag to draw) or read-only (nothing on this
+          // image yet). Surface state either way so the user can tell the
+          // difference between "not yet drawn" and "didn't load".
           const hint = document.createElementNS(SVG_NS, "text");
           hint.setAttribute("x", "10");
-          hint.setAttribute("y", "30");
-          hint.setAttribute("fill", "rgba(255,255,255,0.7)");
+          // Font size scales with the natural image so it stays legible at
+          // any aspect / popup size.
+          const fontPx = Math.max(20, Math.round(img.naturalWidth / 60));
+          hint.setAttribute("y", String(fontPx + 4));
+          hint.setAttribute("fill", "rgba(255,255,255,0.85)");
           hint.setAttribute("stroke", "rgba(0,0,0,0.6)");
           hint.setAttribute("stroke-width", "0.5");
-          hint.setAttribute("font-size", "22");
-          hint.textContent = "drag to draw a bbox";
+          hint.setAttribute("font-size", String(fontPx));
+          hint.textContent = editable
+            ? "drag to draw a bbox"
+            : "no bbox saved for this image";
           svg.appendChild(hint);
           return;
         }
@@ -1824,8 +1842,8 @@ export function MapView({
         rect.setAttribute("fill", "none");
         rect.setAttribute("stroke", "#27ae60");
         rect.setAttribute("stroke-width", String(strokeW));
-        rect.style.pointerEvents = "all";
-        rect.style.cursor = "move";
+        rect.style.pointerEvents = editable ? "all" : "none";
+        rect.style.cursor = editable ? "move" : "default";
         svg.appendChild(rect);
 
         // Class label: place above the bbox if there's room; otherwise inside
@@ -1864,12 +1882,10 @@ export function MapView({
         labelG.appendChild(labelText);
         svg.appendChild(labelG);
 
-        // X delete badge at the top-right corner of the bbox. Always visible
-        // while a bbox exists so the user can drop it in one click without
-        // hunting for the caption button. Drops inside the bbox if there's
-        // no room above; pulls left if it would overflow the image's right
-        // edge.
-        {
+        // X delete badge at the top-right corner of the bbox. Editable mode
+        // only — read-only overlay just shows the saved annotation without
+        // letting the user clear it.
+        if (editable) {
           const badgeR = Math.max(10, Math.round(natW / 90));
           let bx = x2;
           let by = y1;
@@ -2002,7 +2018,9 @@ export function MapView({
       // Persist current bbox to the DB. Skipped if too small (covered by
       // backend validation but checked here too so we don't spam errors).
       // Surface success/failure via the SVG toast so the user has a clear
-      // "saved" signal — the export sidecar reads the same DB rows.
+      // "saved" signal — the export sidecar reads the same DB rows. After a
+      // successful save, auto-flip the asset's side based on which half of
+      // the image the bbox center lives in.
       const persist = async (): Promise<boolean> => {
         if (!bbox) return false;
         const { x1, y1, x2, y2 } = bbox;
@@ -2017,6 +2035,20 @@ export function MapView({
             y2,
           });
           showToast("✓ Saved", true);
+          const natW = img.naturalWidth;
+          const centerX = (x1 + x2) / 2;
+          const inferred: "Left" | "Right" =
+            centerX < natW / 2 ? "Left" : "Right";
+          const currentSide = (asset.side ?? "").toLowerCase();
+          const currentNormalized =
+            currentSide === "left" || currentSide === "lhs"
+              ? "Left"
+              : currentSide === "right" || currentSide === "rhs"
+                ? "Right"
+                : null;
+          if (currentNormalized !== inferred) {
+            onSideChangeRef.current?.(asset.id, inferred);
+          }
           return true;
         } catch (e) {
           console.warn("set_asset_bbox failed", e);
@@ -2209,21 +2241,24 @@ export function MapView({
       } else {
         img.addEventListener("load", () => setup(), { once: true });
       }
-      // Attach pointer listeners on wrapper after svg exists.
-      // We attach them right away on wrapper-level so the events still fire
-      // even before setup() runs (no-ops while svg is null).
-      wrapper.addEventListener("pointerdown", (ev) => {
-        if (svg) onDown(ev as PointerEvent);
-      });
-      wrapper.addEventListener("pointermove", (ev) => {
-        if (svg) onMove(ev as PointerEvent);
-      });
-      wrapper.addEventListener("pointerup", (ev) => {
-        if (svg) onUp(ev as PointerEvent);
-      });
-      wrapper.addEventListener("pointercancel", (ev) => {
-        if (svg) onUp(ev as PointerEvent);
-      });
+      // Edit pointer wiring only when the user is actually allowed to edit.
+      // In read-only overlay mode the SVG itself has pointer-events:none, so
+      // these listeners would never fire — but skip attaching them anyway to
+      // keep the intent obvious.
+      if (editable) {
+        wrapper.addEventListener("pointerdown", (ev) => {
+          if (svg) onDown(ev as PointerEvent);
+        });
+        wrapper.addEventListener("pointermove", (ev) => {
+          if (svg) onMove(ev as PointerEvent);
+        });
+        wrapper.addEventListener("pointerup", (ev) => {
+          if (svg) onUp(ev as PointerEvent);
+        });
+        wrapper.addEventListener("pointercancel", (ev) => {
+          if (svg) onUp(ev as PointerEvent);
+        });
+      }
 
       // Expose a delete handle by attaching a property on the wrapper so the
       // caller (showVertexPopup) can render a "Delete bbox" button that
@@ -2261,10 +2296,12 @@ export function MapView({
       root.className = "asset-popup";
       const grid = document.createElement("div");
       grid.className = "popup-imgs";
-      // BBox mode wraps the image so the SVG overlay can sit on top using
-      // absolute positioning. Without bbox mode, image lives directly in the
-      // grid (original layout).
-      const wrapper = bboxMode
+      // BBox overlay wraps the image so the SVG can sit on top using
+      // absolute positioning. The wrapper is created whenever the overlay is
+      // turned on; edit interactions are further gated on bboxMode inside
+      // installBboxOverlay.
+      const overlayActive = bboxOverlay || bboxMode;
+      const wrapper = overlayActive
         ? (() => {
             const w = document.createElement("div");
             w.style.position = "relative";
@@ -2280,11 +2317,13 @@ export function MapView({
       // fetchPriority hint (Chrome / WebKit) — prioritise the visible popup image.
       (img as HTMLImageElement & { fetchPriority?: string }).fetchPriority =
         "high";
-      if (bboxMode) {
-        // BBox editing needs the FULL image visible; switch to contain so the
-        // SVG overlay maps to known pixel space, and skip the pan-drag UX.
+      if (overlayActive) {
+        // Overlay mode (either editable bbox or read-only render): the image
+        // must stay contain-fit so the SVG viewBox lines up. setup() inside
+        // installBboxOverlay completes the layout. Skip the cover-mode
+        // pan-drag handlers entirely so they can't fight the contain layout.
         img.style.objectFit = "contain";
-        img.style.objectPosition = "center center";
+        img.style.objectPosition = "left top";
       } else {
         // The image uses object-fit:cover so the container's aspect is fixed.
         // Bias the visible crop toward the side the asset is on so the user
@@ -2337,7 +2376,7 @@ export function MapView({
       }
       if (wrapper) {
         wrapper.appendChild(img);
-        installBboxOverlay(wrapper, img, selectedAsset, slot);
+        installBboxOverlay(wrapper, img, selectedAsset, slot, bboxMode);
         grid.appendChild(wrapper);
       } else {
         grid.appendChild(img);
@@ -2351,13 +2390,36 @@ export function MapView({
         ? `${selectedAsset.asset_name} · ${kindLabel}`
         : selectedAsset.asset_name;
       cap.appendChild(strong);
+      // Side tag + flip button. The tag is shown when a side exists; the
+      // flip button is always shown so a no-side asset can still be set.
+      cap.appendChild(document.createTextNode(" "));
       if (selectedAsset.side) {
-        cap.appendChild(document.createTextNode(" "));
         const tag = document.createElement("span");
         tag.className = `side-tag side-${selectedAsset.side.toLowerCase()}`;
         tag.textContent = selectedAsset.side;
         cap.appendChild(tag);
       }
+      const flipBtn = document.createElement("button");
+      flipBtn.type = "button";
+      const currentSide = (selectedAsset.side ?? "").toLowerCase();
+      const nextSide: "Left" | "Right" =
+        currentSide === "left" || currentSide === "lhs" ? "Right" : "Left";
+      flipBtn.textContent = `→ ${nextSide}`;
+      flipBtn.title = `Set side to ${nextSide}`;
+      flipBtn.style.marginLeft = "6px";
+      flipBtn.style.fontSize = "10px";
+      flipBtn.style.padding = "1px 6px";
+      flipBtn.style.border = "1px solid #7f8c8d";
+      flipBtn.style.background = "#fff";
+      flipBtn.style.color = "#34495e";
+      flipBtn.style.borderRadius = "10px";
+      flipBtn.style.cursor = "pointer";
+      flipBtn.addEventListener("click", (ev) => {
+        ev.preventDefault();
+        ev.stopPropagation();
+        onSideChangeRef.current?.(selectedAsset.id, nextSide);
+      });
+      cap.appendChild(flipBtn);
       cap.appendChild(document.createElement("br"));
       const small = document.createElement("small");
       // row_id  ·  video_name   on a single line so users can read both
@@ -2377,7 +2439,7 @@ export function MapView({
         small.appendChild(vidSpan);
       }
       cap.appendChild(small);
-      if (bboxMode && wrapper) {
+      if (bboxMode && wrapper && bboxOverlay) {
         cap.appendChild(document.createElement("br"));
         const badge = document.createElement("span");
         badge.textContent = "BBox mode";
@@ -2534,7 +2596,7 @@ export function MapView({
       markers.forEach((m) => m.remove());
       if (activePopup) activePopup.remove();
     };
-  }, [selectedAsset, imageFolder, popupEnabled, bboxMode]);
+  }, [selectedAsset, imageFolder, popupEnabled, bboxMode, bboxOverlay]);
 
   useEffect(() => {
     const container = containerRef.current;