feat!: upgrade to SvelteKit 3 and adapter-bun

- run sv migrate sveltekit-3: config moves into vite.config.ts, $lib becomes
  #lib, $env/dynamic becomes $app/env/private via src/env.ts, $app/environment
  becomes $app/env, hook types move to @sveltejs/kit/hooks
- env vars stay optional (the migrator defaulted them to ''), and BANCHO_MODE,
  which it missed, is declared and passed to simulatorEnabled
- handleError only logs and masks unknown errors; Kit 3 now routes 404s and
  error(...) through it too
- json()/text() become Response.json()/new Response(); goto keepFocus/noScroll
  becomes reset: false; invalidateAll becomes refreshAll; page.url is copied
  before mutating
- replace adapter-node with @sveltejs/adapter-bun; prod-server.ts wraps
  Bun.serve to add native WebSockets (bunSockets) for /ws paths, since the
  generated server has no websocket option
- drop the Kit readdir patch: Kit 3 sorts route entries itself
- match view and broadcast pages use the live score modules

BREAKING CHANGE: requires SvelteKit 3, TypeScript 6 and Bun 1.4; the build
output is build/index.js from adapter-bun, started through prod-server.ts.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/lib/components/ui/sheet/sheet-content.svelte

@@ -5,8 +5,8 @@
 <script lang="ts">
 	import { Dialog as SheetPrimitive } from 'bits-ui';
 	import XIcon from '@lucide/svelte/icons/x';
-	import { Button } from '$lib/components/ui/button/index.js';
-	import { cn, type WithoutChildrenOrChild } from '$lib/utils.js';
+	import { Button } from '#lib/components/ui/button/index.js';
+	import { cn, type WithoutChildrenOrChild } from '#lib/utils.js';
 	import SheetOverlay from './sheet-overlay.svelte';
 	import SheetPortal from './sheet-portal.svelte';
 	import type { Snippet } from 'svelte';

src/lib/components/ui/sheet/sheet-description.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
 	import { Dialog as SheetPrimitive } from 'bits-ui';
-	import { cn } from '$lib/utils.js';
+	import { cn } from '#lib/utils.js';
 
 	let {
 		ref = $bindable(null),

src/lib/components/ui/sheet/sheet-footer.svelte

@@ -1,5 +1,5 @@
 <script lang="ts">
-	import { cn, type WithElementRef } from '$lib/utils.js';
+	import { cn, type WithElementRef } from '#lib/utils.js';
 	import type { HTMLAttributes } from 'svelte/elements';
 
 	let {

src/lib/components/ui/sheet/sheet-header.svelte

@@ -1,5 +1,5 @@
 <script lang="ts">
-	import { cn, type WithElementRef } from '$lib/utils.js';
+	import { cn, type WithElementRef } from '#lib/utils.js';
 	import type { HTMLAttributes } from 'svelte/elements';
 
 	let {

src/lib/components/ui/sheet/sheet-overlay.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
 	import { Dialog as SheetPrimitive } from 'bits-ui';
-	import { cn } from '$lib/utils.js';
+	import { cn } from '#lib/utils.js';
 
 	let {
 		ref = $bindable(null),

src/lib/components/ui/sheet/sheet-title.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
 	import { Dialog as SheetPrimitive } from 'bits-ui';
-	import { cn } from '$lib/utils.js';
+	import { cn } from '#lib/utils.js';
 
 	let {
 		ref = $bindable(null),