Align repo config with global development standards

- Add missing tsconfig strictness flags (noUncheckedIndexedAccess,
  exactOptionalPropertyTypes, noImplicitOverride,
  noPropertyAccessFromIndexSignature) and fix all resulting type errors
- Replace ESLint/Prettier with oxlint 1.48.0 and oxfmt 0.33.0
- Pin all frontend and backend dependencies to exact versions
- Pin GitHub Actions to SHA hashes with persist-credentials: false
- Fix CI Python version mismatch (3.12 -> 3.14) and ruff target-version
- Add vitest 4.0.18 with jsdom environment for frontend testing
- Add ty 0.0.17 for Python type checking (non-blocking in CI)
- Add actionlint and zizmor CI job for workflow linting and security audit
- Add Dependabot config for npm, pip, and github-actions
- Update CLAUDE.md and pre-commit hooks to reflect new tooling
- Ignore Claude Code sandbox artifacts in gitignore

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

frontend/src/pages/admin/AdminRuns.tsx

@@ -14,16 +14,12 @@ export function AdminRuns() {
   const [statusFilter, setStatusFilter] = useState('')
   const [gameFilter, setGameFilter] = useState('')
 
-  const gameMap = useMemo(
-    () => new Map(games.map((g) => [g.id, g.name])),
-    [games]
-  )
+  const gameMap = useMemo(() => new Map(games.map((g) => [g.id, g.name])), [games])
 
   const filteredRuns = useMemo(() => {
     let result = runs
     if (statusFilter) result = result.filter((r) => r.status === statusFilter)
-    if (gameFilter)
-      result = result.filter((r) => r.gameId === Number(gameFilter))
+    if (gameFilter) result = result.filter((r) => r.gameId === Number(gameFilter))
     return result
   }, [runs, statusFilter, gameFilter])
 
@@ -31,10 +27,7 @@ export function AdminRuns() {
     () =>
       [
         ...new Map(
-          runs.map((r) => [
-            r.gameId,
-            gameMap.get(r.gameId) ?? `Game #${r.gameId}`,
-          ])
+          runs.map((r) => [r.gameId, gameMap.get(r.gameId) ?? `Game #${r.gameId}`])
         ).entries(),
       ].sort((a, b) => a[1].localeCompare(b[1])),
     [runs, gameMap]