refactor(tui): fold structure blocks to tags in read mode

[Ariestar]

Purpose

Read mode now collapses every structure part to its <:…:>\ tag line (<:tool:Bash call:>, <:thinking:>, …) instead of a plain channel summary (\ ools: Bash x2). Raw mode keeps the complete block. Both modes render the tags with the same gray style — read and raw share styling, not content.

Changes

• \structured_parts_text\ emits each part's open-marker tag instead of channel summaries; \collapse_structure_markers\ and its dead styling are deleted.
• Content labels become
  ead\ /
  aw.

Validation

• \cargo test --workspace\ (332 + 205), clippy -D warnings, \cargo fmt --check\ pass; workspace tests rewritten to assert read shows tags only (payloads dropped) and raw shows full blocks.

Summary by CodeRabbit

• Improvements
  • Updated reading mode to display each tool and skill structure marker individually and in dialogue order.
  • Preserved non-structure text while omitting structure payloads in reading mode.
  • Simplified content mode labels to “read” and “raw.”
  • Updated help text and workspace titles to reflect the revised terminology.
• Bug Fixes
  • Removed outdated fold-summary styling and aggregation behavior in reading mode.

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📥 Commits

Reviewing files that changed from the base of the PR and between e8789f5 and 9a7622d.

📒 Files selected for processing (5)

• src/tui/content/markdown.rs
• src/tui/content/text.rs
• src/tui/content/view.rs
• src/tui/workspace/help.rs
• src/tui/workspace/tests.rs

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📝 Walkthrough

Walkthrough

Reading mode now emits individual structure markers in dialogue order and omits their payloads. Markdown no longer detects fold summaries. Content mode labels and help text now use read and raw.

Changes

Reading-mode content

Layer / File(s)	Summary
Structure marker handling src/tui/content/markdown.rs	Markdown parsing now styles only channel structure markers. Fold-summary detection and its test were removed.
Individual structure rendering src/tui/content/text.rs, src/tui/workspace/tests.rs	Reading mode emits one label per structure part, preserves order and assistant text, and omits tool payloads.
Content mode labels src/tui/content/view.rs, src/tui/workspace/help.rs, src/tui/workspace/tests.rs	Mode labels and help text now use read and raw. Workspace title expectations were updated.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to 9a762

Read mode now shows structure tags while raw mode retains full blocks, with updated tests and checks passing; no actionable merge-blocking risk remains.

Possibly related PRs

• Ariestar/sivtr#133: Both PRs change reading-mode structure rendering and its workspace tests.

🚥 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 describes the main TUI change: collapsing structure blocks into tags in read mode.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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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• Create PR with unit tests
• Commit unit tests in branch tui/content-mode-unify

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