teernisse 403800be22 feat(tui): add snapshot test infrastructure + terminal compat matrix (bd-2nfs) ...

- 6 deterministic snapshot tests at 120x40 with FakeClock frozen at 2026-01-15T12:00:00Z
- Buffer-to-plaintext serializer resolving chars, graphemes, and wide-char continuations
- Golden file management with UPDATE_SNAPSHOTS=1 env var for regeneration
- Snapshot diff output on mismatch for easy debugging
- Tests: dashboard, issue list, issue detail, MR list, search results, empty state
- TERMINAL_COMPAT.md template for manual QA across iTerm2/tmux/Alacritty/kitty/WezTerm

2026-02-19 00:38:11 -05:00

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