TUI walking skeleton (Phase 4)

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First implementation milestone: Cargo project, dependencies,
and a minimal but functional TUI shell built on Ratatui +
Crossterm + Tokio in the Elm-style update/view pattern
(Candidate A from Phase 2/3 selection).

Includes:
- Three-region layout: items list (left), output + input + hint
  (right), bottom status bar with mode-aware shortcuts.
- Two themes (light, dark) plus COLORFGBG auto-detect, per
  NFR-7. CLI: --theme {light,dark}, --log-file <path>.
- Input modes per ADR-0003: simple (default), advanced, with
  the `:` one-shot escape including immediate prompt reaction
  ("Advanced:" label, advanced border) and auto-inserted space
  after a leading `:` in simple mode.
- App-level commands: `quit`/`q`, `mode simple`/`mode advanced`
  (canonical list per ADR-0003 — remaining commands land in
  later iterations).
- File logging via tracing, defaulting to ~/.rdbms-playground/
  playground.log so the TUI is not corrupted by stdio.

Testing per ADR-0008:
- Tier 1: 29 unit tests covering input handling, mode switch,
  one-shot escape, auto-space, output buffering, CLI parsing.
- Tier 2: 4 insta snapshots (default simple/advanced/light,
  one-shot active) of TestBackend frames.
- Tier 3: 7 integration tests driving synthetic events through
  App::update + render path.

All green: 36 tests, 0 failures, 0 skips. Clippy clean with
nursery lints enabled.

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This commit is contained in:

claude@clouddev1

2026-05-07 11:17:58 +00:00

parent aebfc7dcba

commit 25a0f1260f

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