TUI footer: right-align context and degrade shortcut summary + mode cleanly

[charley-oai]

Summary

Refines the bottom footer layout to keep % context left right-aligned while making the left side degrade cleanly

Behavior with empty textarea

Full width:

Less:

Min width:

Behavior with message in textarea and agent running (steer enabled)

Full width:

Less:

Less:

Less:

Less:

Notes / Edge Cases

• In steer mode while typing, the queue hint no longer replaces the mode label; it renders as tab to queue message · {Mode}.
• Collapse priorities differ by state:
  • With the queue hint active, % context left is hidden before shortening or dropping the queue hint.
  • In the empty + non-running state, ? for shortcuts is dropped first, and % context left is only shown if (shift+tab to cycle) can also fit.
• Transient instructional states (? overlay, Esc hint, Ctrl+C/D reminders, and flash/override hints) intentionally suppress the
  mode label (and context) to focus the next action.

Implementation Notes

• Renamed the base footer modes to make the state explicit: ComposerEmpty and ComposerHasDraft, and compute the base mode
  directly from emptiness.
• Unified collapse behavior in single_line_footer_layout for both base modes, with:
  • Queue-hint behavior that prefers keeping the queue hint over context.
  • A cycle-hint guard that prevents context from reappearing after (shift+tab to cycle) is dropped.
• Kept rendering responsibilities explicit:
  • single_line_footer_layout decides what fits.
  • render_footer_line renders a chosen line.
  • render_footer_from_props renders the canonical mode-to-text mapping.
• Expanded snapshot coverage:
  • Added footer_collapse_snapshots in chat_composer.rs to lock the distinct collapse states across widths.
  • Consolidated the width-aware snapshot helper usage (e.g., snapshot_composer_state_with_width,
    snapshot_footer_with_mode_indicator).

[charley-oai]

@codex review this

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. 👍

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[charley-oai]

@codex review this

[charley-oai]

@codex review this

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[charley-oai]

@codex review this

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Codex Review: Didn't find any major issues. More of your lovely PRs please.

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@codex review this

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Codex Review: Didn't find any major issues. More of your lovely PRs please.

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