style: format web/src with oxfmt defaults (via vp fmt)

One-time mechanical sweep, isolated from any functional change.
- oxfmt defaults: double quotes, semicolons, 2-space indent, LF,
  printWidth 100, trailing commas, bracket spacing, arrow parens.
- vite.config.ts gains an fmt.ignorePatterns block for web/static:
  vendored/minified assets (htmx.min.js, compiled css) must never
  be reformatted.
- Verified: rebuild after the sweep produces byte-identical JS/CSS
  bundles; only sourcemaps changed (they embed sourcesContent).

vite.config.ts

@@ -39,6 +39,11 @@ const cleanStaleChunks = () => {
 };
 
 export default defineConfig({
+  // web/static holds vendored and build-output assets (htmx.min.js,
+  // compiled css) that must never be reformatted; only web/src is fmt scope.
+  fmt: {
+    ignorePatterns: ["web/static/**"],
+  },
   resolve: {
     alias: {
       "@": "/web/src",