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/Home.tsx

@@ -3,8 +3,7 @@ import { useRuns } from '../hooks/useRuns'
 import type { RunStatus } from '../types'
 
 const statusStyles: Record<RunStatus, string> = {
-  active:
-    'bg-green-100 text-green-800 dark:bg-green-900/40 dark:text-green-300',
+  active: 'bg-green-100 text-green-800 dark:bg-green-900/40 dark:text-green-300',
   completed: 'bg-blue-100 text-blue-800 dark:bg-blue-900/40 dark:text-blue-300',
   failed: 'bg-red-100 text-red-800 dark:bg-red-900/40 dark:text-red-300',
 }
@@ -75,10 +74,7 @@ export function Home() {
             <h2 className="text-sm font-medium text-gray-500 dark:text-gray-400 uppercase tracking-wide">
               Recent Runs
             </h2>
-            <Link
-              to="/runs"
-              className="text-sm text-blue-600 dark:text-blue-400 hover:underline"
-            >
+            <Link to="/runs" className="text-sm text-blue-600 dark:text-blue-400 hover:underline">
               View all
             </Link>
           </div>
@@ -91,9 +87,7 @@ export function Home() {
               >
                 <div className="flex items-center justify-between">
                   <div>
-                    <h3 className="font-medium text-gray-900 dark:text-gray-100">
-                      {run.name}
-                    </h3>
+                    <h3 className="font-medium text-gray-900 dark:text-gray-100">{run.name}</h3>
                     <p className="text-xs text-gray-500 dark:text-gray-400">
                       {new Date(run.startedAt).toLocaleDateString(undefined, {
                         year: 'numeric',