fix: update PR workflow to exclude e2e tests from unit test phase

The workflow was running 'bun test' without arguments, which caused
Bun to scan all directories including e2e/, picking up Playwright tests
that should only run in the acceptance-tests phase.

Updated to explicitly target unit/component tests:
- src/__tests__/unit/
- src/__tests__/*.test.tsx
- src/__tests__/auth-simple.test.ts

.gitea/workflows/pr.yml

@@ -20,7 +20,7 @@ jobs:
         run: bun install
 
       - name: Run unit tests
-        run: bun test
+        run: bun test src/__tests__/unit/ src/__tests__/*.test.tsx src/__tests__/auth-simple.test.ts
 
   acceptance-tests:
     runs-on: ubuntu-latest