diff --git a/application/ui/rsbuild.config.ts b/application/ui/rsbuild.config.ts
index 848c3ebf25..fc0e0f786e 100644
--- a/application/ui/rsbuild.config.ts
+++ b/application/ui/rsbuild.config.ts
@@ -128,6 +128,13 @@ export default defineConfig({
                 ...config,
                 resolve: { ...config.resolve, extensions },
                 watchOptions: { ...config.watchOptions, ignored: ['**/src-tauri/**'] },
+                // opencv.js (emscripten, under src/ so it's parsed) references
+                // `__dirname` for Node environment detection. Rspack's default
+                // `warn-mock` mocks it to '/' AND warns on every build. In the
+                // browser opencv takes the non-Node code path, so the mock value
+                // is never used — switch to 'mock' to keep the (identical) runtime
+                // behavior without the noisy build warning.
+                node: { ...config.node, __dirname: 'mock', __filename: 'mock' },
             };
         },
     },
@@ -135,7 +142,10 @@ export default defineConfig({
         headers: {
             'Cross-Origin-Embedder-Policy': 'credentialless',
             'Cross-Origin-Opener-Policy': 'same-origin',
-            'Cache-Control': 'public, max-age=31536000, immutable',
+            // Must NOT be 'immutable': dev async chunks are not content-hashed, so an
+            // immutable cache causes the browser to keep serving stale chunk/HMR runtime
+            // URLs after a rebuild (stale worker imports, mismatched hmr.js client).
+            'Cache-Control': 'no-cache',
             'Content-Security-Policy':
                 "default-src 'self'; " +
                 "script-src 'self' 'unsafe-eval' blob:; " +