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).

web/src/library-switcher.ts

@@ -43,11 +43,7 @@ export async function switchWithTransition(
   }
 
   try {
-    container.classList.add(
-      "opacity-0",
-      "transition-opacity",
-      "duration-150",
-    );
+    container.classList.add("opacity-0", "transition-opacity", "duration-150");
     await new Promise((resolve) => setTimeout(resolve, 150));
 
     loading.classList.remove("hidden");
@@ -68,12 +64,7 @@ export async function switchWithTransition(
       container.classList.remove("transition-opacity", "duration-300");
     }, 300);
   } catch (error) {
-    container.classList.remove(
-      "opacity-0",
-      "transition-opacity",
-      "duration-150",
-      "duration-300",
-    );
+    container.classList.remove("opacity-0", "transition-opacity", "duration-150", "duration-300");
     showToast("Failed to load library", "error");
     console.error("Switch library error:", error);
   } finally {
@@ -86,18 +77,14 @@ export interface LibrarySwitcherOptions {
 }
 
 export function initLibrarySwitcher(options: LibrarySwitcherOptions): void {
-  const librarySelect = document.getElementById(
-    "library-select",
-  ) as HTMLSelectElement;
+  const librarySelect = document.getElementById("library-select") as HTMLSelectElement;
   if (!librarySelect) return;
 
   const stored = localStorage.getItem("selectedLibrary");
   if (stored === ALL_LIBRARIES) {
     librarySelect.value = "";
   } else if (stored) {
-    const option = librarySelect.querySelector(
-      `option[value="${stored}"]`,
-    );
+    const option = librarySelect.querySelector(`option[value="${stored}"]`);
     if (option) {
       librarySelect.value = stored;
     }