Expand vite watch ignore list to prevent silent crashes on merge

Vite only needs to watch frontend/ sources. Ignore git objects,
Rust source, Cargo files, node_modules, and vendor directories
that change in bulk during squash merges.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/vite.config.ts

@@ -19,7 +19,15 @@ export default defineConfig(() => {
         },
       },
       watch: {
-        ignored: ["**/.story_kit/**", "**/target/**"],
+        ignored: [
+          "**/.story_kit/**",
+          "**/target/**",
+          "**/.git/**",
+          "**/server/**",
+          "**/Cargo.*",
+          "**/vendor/**",
+          "**/node_modules/**",
+        ],
       },
     },
     build: {