Every split is by test-group/concern, with the shared setup moved to a
sibling helper the splits import. All 313 tests are preserved -- the count
is unchanged and `test('…')` names are byte-identical to the originals
(verified by diffing the sorted name lists).
note_repository_test 677 -> 4 files + note_repository_helpers
capture_screen_test 660 -> 4 files + capture_screen_harness
note_editor_test 502 -> 3 files + note_editor_harness
port_guard_test 405 -> 3 files + port_guard_fakes
wrapper_server_test 402 -> 2 files + wrapper_server_harness
settings_screen_test 391 -> 2 files + settings_screen_harness
github_mirror_screen_test 365 -> 2 files + github_mirror_harness
notes_list_screen_test 347 -> 2 files + notes_list_harness
analytics_service_test 300 -> 2 files + analytics_helpers
Helpers are deliberately NOT named `*_test.dart`; the runner would collect
them and fail on the missing `main()`.
Three things did not survive a mechanical split and were handled explicitly:
* wrapper_server's `enabledOrigin` closes over the `late root` that setUp
assigns, so a top-level function cannot see it. It is now a
WrapperHarness class with an install() that registers the setUp/tearDown
pair -- the only structural change in this commit.
* note_repository's splits each repeat `setUpAll(sqfliteFfiInit)`, and
analytics' each repeat `@TestOn('vm')`. Omitting either fails quietly
(uninitialised sqflite / wrong platform) rather than loudly.
* capture_screen's `recordingMock` was declared mid-file between two
tests, so it moved to the harness rather than being dropped.
Verified: 313 tests pass (same as before the refactor), 100% coverage.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
