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/ShinyBox.tsx

@@ -3,7 +3,7 @@ import type { EncounterDetail } from '../types'
 
 interface ShinyBoxProps {
   encounters: EncounterDetail[]
-  onEncounterClick?: (encounter: EncounterDetail) => void
+  onEncounterClick?: ((encounter: EncounterDetail) => void) | undefined
 }
 
 export function ShinyBox({ encounters, onEncounterClick }: ShinyBoxProps) {
@@ -22,9 +22,7 @@ export function ShinyBox({ encounters, onEncounterClick }: ShinyBoxProps) {
             <PokemonCard
               key={enc.id}
               encounter={enc}
-              onClick={
-                onEncounterClick ? () => onEncounterClick(enc) : undefined
-              }
+              onClick={onEncounterClick ? () => onEncounterClick(enc) : undefined}
             />
           ))}
         </div>