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/components/admin/PokemonSelector.tsx

@@ -4,7 +4,7 @@ import { usePokemonList } from '../../hooks/useAdmin'
 interface PokemonSelectorProps {
   label: string
   selectedId: number | null
-  initialName?: string
+  initialName?: string | undefined
   onChange: (id: number | null) => void
 }
 
@@ -46,9 +46,7 @@ export function PokemonSelector({
         placeholder="Search pokemon..."
         className="w-full px-3 py-2 border rounded-md dark:bg-gray-700 dark:border-gray-600"
       />
-      {selectedId && (
-        <input type="hidden" name={label} value={selectedId} required />
-      )}
+      {selectedId && <input type="hidden" name={label} value={selectedId} required />}
       {open && pokemon.length > 0 && (
         <ul className="absolute z-10 mt-1 w-full bg-white dark:bg-gray-800 border border-gray-200 dark:border-gray-600 rounded-md shadow-lg max-h-48 overflow-y-auto">
           {pokemon.map((p) => (
@@ -63,9 +61,7 @@ export function PokemonSelector({
                 p.id === selectedId ? 'bg-blue-50 dark:bg-blue-900/30' : ''
               }`}
             >
-              {p.spriteUrl && (
-                <img src={p.spriteUrl} alt="" className="w-6 h-6" />
-              )}
+              {p.spriteUrl && <img src={p.spriteUrl} alt="" className="w-6 h-6" />}
               <span>
                 #{p.nationalDex} {p.name}
               </span>