Compact home keymap into primary/secondary two-line footer

[Copilot]

The home screen footer had become too wide and visually flat as more shortcuts were added. This change restructures the always-visible key guide into two lines, separating primary actions from secondary actions without changing any bindings.

• Home footer layout

  • Replaced the single inline home key guide with a compact two-line layout:
    • primary: start / answer mode toggle / quit
    • secondary: new / review / stats / settings
  • Kept help screen behavior separate; only the persistent home footer changed

• Rendering changes

  • Added a home-specific compact guide renderer on top of the existing keymap state
  • Reused shared guide rendering flow so home-specific and generic inline guides follow the same formatting path

• Copy/i18n

  • Added dedicated localized labels for compact home footer text where the persistent footer should differ from generic action labels

• Regression coverage

  • Updated home view assertions to verify the compact footer output via the same helper used by the renderer
  • Extended i18n key coverage for the new compact footer labels

[Enter]開始  [Tab]方式切替  [q]終了
[n]新規  [r]復習  [s]統計  [c]設定

• Screenshot
  

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

View in Codacy

🟢 Metrics 11 complexity

Metric	Results
Complexity	11

View in Codacy

_{TIP This summary will be updated as you push new changes. Give us feedback}