feat: enhance image import and solvability calculation (v1.13.0)

- Implement non-linear threshold slider (histogram percentile method)
- Add real-time solvability calculation with progress indicator
- Improve solvability logic with generative lookahead (smash)
- Update ImageImportModal UI (alpha preview, grid size 5-80)
- Add missing translations and difficulty labels
- Optimize web worker pool with queue clearing and progress reporting
- Fix mobile camera support and UI layout

dev-dist/sw.js

@@ -82,7 +82,7 @@ define(['./workbox-7a5e81cd'], (function (workbox) { 'use strict';
    */
   workbox.precacheAndRoute([{
     "url": "index.html",
-    "revision": "0.0dmrmul42fg"
+    "revision": "0.geiftdl7j9o"
   }], {});
   workbox.cleanupOutdatedCaches();
   workbox.registerRoute(new workbox.NavigationRoute(workbox.createHandlerBoundToURL("index.html"), {