story-kit: create 112_story_add_test_coverage_for_app_tsx

.story_kit/work/1_upcoming/112_story_add_test_coverage_for_app_tsx.md

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+---
+name: "Add test coverage for App.tsx"
+---
+
+# Story 112: Add test coverage for App.tsx
+
+## User Story
+
+As a developer, I want better test coverage for App.tsx, so that regressions in the main application component are caught early.
+
+## Acceptance Criteria
+
+- [ ] App.tsx reaches 85% coverage (currently 73.1%, 43 lines missing)
+- [ ] Tests cover additional integration-style scenarios for the main app component
+- [ ] All vitest tests pass
+- [ ] No production code changes are made
+
+## Out of Scope
+
+- TBD