fix(sidebar): restore session rename key

[bnema]

Summary

• Restore context-sensitive r handling so sessions invoke the existing rename prompt while categories keep inline rename.
• Wire session rename through the sidebar UI action layer.
• Surface concrete rename failures from prompt submissions and run prompt commands in the background.

Test Plan

• rtk go test ./internal/adapters/uity ./internal/app
• rtk go test ./...

Summary by CodeRabbit

• New Features

  • Added session renaming functionality accessible via the r key using tmux rename prompt.

• Documentation

  • Updated README to document the new session rename behavior alongside existing category rename functionality.

• Tests

  • Added test coverage for session rename workflows and edge cases.

• Bug Fixes

  • Added error message display when session operations fail.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: a8788cb6-39c0-4631-92a5-c59a533e832b

📥 Commits

Reviewing files that changed from the base of the PR and between e0279bf and b097cd0.

📒 Files selected for processing (8)

• README.md
• cmd/tmux-session-sidebar/uity_runner.go
• internal/adapters/uity/sidebar_model.go
• internal/adapters/uity/tree_render_test.go
• internal/app/router.go
• internal/app/session_actions.go
• internal/app/session_actions_test.go
• internal/app/sidebar_ui.go

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📝 Walkthrough

Walkthrough

The PR extends the sidebar r key from renaming only categories to a unified flow that also renames sessions. A new RenameSession func(string) bool callback is added to the Actions and SidebarUIActions structs, wired through the router and UI runner. commandPrompt gains background execution (run-shell -b), and a new displayActionFailure helper emits a tmux message on rename errors.

Changes

Session Rename via r Key

Layer / File(s)	Summary
RenameSession contracts and failure helpers internal/adapters/uity/sidebar_model.go, internal/app/sidebar_ui.go, internal/app/session_actions.go	RenameSession func(string) bool added to Actions and SidebarUIActions. displayActionFailure helper introduced to emit tmux display-message on rename failure; called from renameSession on error. commandPrompt updated to use run-shell -b for background execution.
Unified rename logic and app wiring internal/adapters/uity/sidebar_model.go, internal/app/router.go, cmd/tmux-session-sidebar/uity_runner.go	startRenameSelectedCategory replaced by startRenameSelected, which branches on selected item: categories enter ModeRenameCategory inline, sessions call actions.RenameSession directly and reload the tree. Wired through buildSidebarActions via handleMetadataAction and mapped in toUIActions.
Tests and README internal/adapters/uity/tree_render_test.go, internal/app/session_actions_test.go, README.md	New tests cover r on session rows (calls RenameSession, reloads tree, stays in ModeBrowse), r on non-renamable rows (no-op), and renameSession invalid-name failure (error identity + display-message log). run-shell -b assertion added to prompt test. README updated to document dual rename UX.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• bnema/tmux-session-sidebar#20: Overlaps at the renameSession implementation in internal/app/session_actions.go, which this PR modifies to add failure display and background execution.
• bnema/tmux-session-sidebar#61: Both touch buildSidebarActions in internal/app/router.go to add or restructure sidebar action handler wiring.
• bnema/tmux-session-sidebar#64: This PR builds directly on the category-first sidebar tree rename infrastructure established in PR #64, extending it to cover sessions.

Poem

🐇 A tap of r and sessions heed the call,
No longer just for categories tall.
A prompt appears, tmux awaits your name,
Background shells and errors display their shame.
The sidebar tree reloads with newfound grace —
This rabbit renamed sessions with a smile on its face! 🌿

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 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 summarizes the main change: restoring session rename functionality in the sidebar, which aligns with the primary objective of reintroducing context-sensitive handling of the rename key.
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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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/sidebar-session-rename-key

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