feat(tui): label placeholder rows [CREATE COMMIT] / [CREATE BRANCH]

[narnaud]

A commit being placed and a branch being named have no short ID. They used
to borrow the column with a dim '..', which reads like an unresolved ID; an
inverted tag now says what the row is.

Summary by CodeRabbit

• New Features

  • Added clear [CREATE COMMIT] and [CREATE BRANCH] labels for pending rows in the terminal interface.
  • Added distinct styling for pending commit and branch tags.

• Style

  • Simplified commit row displays by removing redundant abbreviated hash placeholders.

[coderabbitai]

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Reviewing files that changed from the base of the PR and between 7e6bad1 and 8d0ea49.

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Configuration used: Repository UI

Review profile: CHILL

Plan: Advanced

Run ID: 3e0acb58-7da4-4993-9b2d-4c97f80feff4

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Reviewing files that changed from the base of the PR and between b485b8a and 7e6bad1.

📒 Files selected for processing (4)

• specs/020-tui.md
• src/tui/app.rs
• src/tui/app_test.rs
• src/tui/theme.rs

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📝 Walkthrough

Walkthrough

The TUI now renders pending branch and commit rows with explicit styled labels. The theme exposes the label style, and the specification and rendering tests reflect the new output.

Changes

TUI pending row labels

Layer / File(s)	Summary
Pending tag style src/tui/theme.rs	TuiTheme exposes pending_tag. from_graph_theme initializes it with the label color, reversed display, and bold text.
Pending row rendering src/tui/app.rs, src/tui/app_test.rs, specs/020-tui.md	Branch placeholders render [CREATE BRANCH]. Commit placeholders render [CREATE COMMIT] without a fabricated short ID or padding. Tests and the TUI specification use the updated format.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Feature

Merge Risk: ⚪ Minimal · up to 7e6ba

Pending commit and branch placeholders retain their existing file-count behavior while displaying the new labels, so no actionable merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding [CREATE COMMIT] and [CREATE BRANCH] labels for placeholder TUI rows.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 3 files. (1 skipped: 1 …
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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