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/events.ts

@@ -50,61 +50,39 @@ function onDelegatedKeydown(
   });
 }
 
-function getDataAttribute(
-  element: HTMLElement,
-  name: string,
-): string | undefined {
+function getDataAttribute(element: HTMLElement, name: string): string | undefined {
   return element.dataset[name];
 }
 
-function setDataAttribute(
-  element: HTMLElement,
-  name: string,
-  value: string,
-): void {
+function setDataAttribute(element: HTMLElement, name: string, value: string): void {
   element.dataset[name] = value;
 }
 
-function onClick(
-  element: HTMLElement | null,
-  handler: (event: MouseEvent) => void,
-): void {
+function onClick(element: HTMLElement | null, handler: (event: MouseEvent) => void): void {
   if (element) {
     element.addEventListener("click", handler);
   }
 }
 
-function onSubmit(
-  element: HTMLFormElement | null,
-  handler: (event: Event) => void,
-): void {
+function onSubmit(element: HTMLFormElement | null, handler: (event: Event) => void): void {
   if (element) {
     element.addEventListener("submit", handler);
   }
 }
 
-function onChange(
-  element: HTMLElement | null,
-  handler: (event: Event) => void,
-): void {
+function onChange(element: HTMLElement | null, handler: (event: Event) => void): void {
   if (element) {
     element.addEventListener("change", handler);
   }
 }
 
-function onKeydown(
-  element: HTMLElement | null,
-  handler: (event: KeyboardEvent) => void,
-): void {
+function onKeydown(element: HTMLElement | null, handler: (event: KeyboardEvent) => void): void {
   if (element) {
     element.addEventListener("keydown", handler);
   }
 }
 
-function onInput(
-  element: HTMLElement | null,
-  handler: (event: Event) => void,
-): void {
+function onInput(element: HTMLElement | null, handler: (event: Event) => void): void {
   if (element) {
     element.addEventListener("input", handler);
   }