Adds test/widget/thread_detail_screen_test.dart (6 tests) covering: empty-thread placeholder, sender display, default expansion of latest email, collapse on tap, star icon for flagged email, and plain text body rendering
Adds test/widget/search_screen_test.dart (6 tests) covering: initial placeholder, sub-3-char debounce guard, "No results" state, email results under "Messages" section, folder results under "Folders" section, and clear-button reset
Extends the shared helpers.dart test router with the ThreadDetailScreen route so tests can navigate to it by URL
Test plan
task check-fast passes (dart format + analyze + all widget/unit tests green)
Both new test files pass in isolation
## Summary
- Adds `test/widget/thread_detail_screen_test.dart` (6 tests) covering: empty-thread placeholder, sender display, default expansion of latest email, collapse on tap, star icon for flagged email, and plain text body rendering
- Adds `test/widget/search_screen_test.dart` (6 tests) covering: initial placeholder, sub-3-char debounce guard, "No results" state, email results under "Messages" section, folder results under "Folders" section, and clear-button reset
- Extends the shared `helpers.dart` test router with the `ThreadDetailScreen` route so tests can navigate to it by URL
## Test plan
- [x] `task check-fast` passes (dart format + analyze + all widget/unit tests green)
- [x] Both new test files pass in isolation
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Summary
test/widget/thread_detail_screen_test.dart(6 tests) covering: empty-thread placeholder, sender display, default expansion of latest email, collapse on tap, star icon for flagged email, and plain text body renderingtest/widget/search_screen_test.dart(6 tests) covering: initial placeholder, sub-3-char debounce guard, "No results" state, email results under "Messages" section, folder results under "Folders" section, and clear-button resethelpers.darttest router with theThreadDetailScreenroute so tests can navigate to it by URLTest plan
task check-fastpasses (dart format + analyze + all widget/unit tests green)