Drops the libsqlite3-missing skip cohort now that the ci-flutter
runner image installs libsqlite3-0 (CI-runner commit on its main).
Per-file removals (no behavior change in tests themselves — they
just stop being skipped):
- `@Tags(['drift'])` + `library;` directive from 5 files.
- `const _skipDrift = ...;` declaration + its rationale comment
from 6 files (the 5 above + like_button_test.dart, which had its
own _skipDrift for the rollback-via-drift case).
- `skip: _skipDrift` annotations from 17 test invocations across
those 6 files (16 single-line + 1 multi-line in like_button).
- Stale `@Tags(['drift']) tier covers it` reference in
home_screen_test.dart's drift-coverage comment.
Net -79 +18 lines across 7 files; 17 previously-silent tests are
now part of the CI signal. Fable #399.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>