fix(heal): restore inpaint-web MI-GAN neural model to resolve grey blob bug

docker/frontend/src/App.tsx

@@ -31,6 +31,7 @@ import { clearSession, forgetPhoto, loadPhoto, loadState, savePhoto, saveState,
 import { analyzeCustomFrame, clearCustomFrame, loadCustomFrame, saveCustomFrame, type CustomFrameData } from './engine/customFrame';
 import { keep } from './remember';
 import { preloadSuperRes, upscaleJpeg } from './engine/superRes';
+import { preloadInpaint, clearInpaintCache } from './engine/inpaint';
 import { api, type Photo, type SavedRecipe } from './api';
 import { refreshAuth, useAuth } from './auth';
 import { TIERS } from './config/tiers';
@@ -1568,6 +1569,7 @@ export function Workspace() {
   );
   const clearHealSpots = useCallback(() => {
     remember();
+    clearInpaintCache();
     // The field is what "this photo was healed" means, so CLEAR drops it rather
     // than leaving an empty list behind.
     setAdjustment({ heal: undefined });
@@ -1616,6 +1618,7 @@ export function Workspace() {
   const editBrushSpots = useCallback(
     (spots: (HealSpot | MosaicSpot)[], undo: boolean) => {
       if (undo) remember();
+      clearInpaintCache();
       const list = spots.length ? spots : undefined;
       if (brushTool === 'mosaic') setAdjustment({ mosaic: list as MosaicSpot[] | undefined });
       else setAdjustment({ heal: list as HealSpot[] | undefined });
@@ -3707,6 +3710,11 @@ export function Workspace() {
           setBrushTool(null);
         } else {
           setBrushTool('heal');
+          // The 27MB of model behind the brush, fetched while the visitor aims.
+          // Turning the tool on is not the repair, but it is the moment the
+          // repair becomes certain enough to spend the download on — see
+          // engine/inpaint.ts on why preloading is bytes and not the runtime.
+          preloadInpaint();
         }
       },
     },