fix(ui): restore playlist expansion layout

[bjarneo]

Fixes #283.

• Vertically center collapsed playback frames.
• Let Ctrl+X expand the playlist to all available body rows.
• Add layout regressions for centering and expanded height.

Tests: make check

Summary by CodeRabbit

• Bug Fixes
  • Improved playlist layout sizing when expanded, allowing it to use the available screen height.
  • Vertically centered collapsed playlist content within the terminal window.
  • Refined layout behavior for content-first views.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 7a3f5b54-5438-4913-84be-b63f3c64fab9

📥 Commits

Reviewing files that changed from the base of the PR and between 7e74525 and e6c019e.

📒 Files selected for processing (1)

• ui/model/layout_test.go

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📝 Walkthrough

Walkthrough

Playlist layout calculation now allows expanded playlists to use available body rows. Frame rendering vertically centers collapsed content, with tests covering expanded sizing and centering behavior.

Changes

Playlist layout behavior

Layer / File(s)	Summary
Expanded playlist sizing ui/model/layout.go, ui/model/model.go, ui/model/layout_test.go	Expanded playlists use bodyRows instead of the expanded visibility cap, while content-first layouts retain the alternate limit path. Tests verify the resulting row count.
Vertical frame centering ui/model/view.go, ui/model/layout_test.go	centerFrame adds top padding based on terminal and frame heights while preserving horizontal indentation. A test verifies collapsed-frame centering.

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

Possibly related PRs

• bjarneo/cliamp#217: Addresses expanded-playlist viewport height and scroll recalculation around view toggling.

🚥 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 matches the main change: restoring playlist expansion layout.
Linked Issues check	✅ Passed	The changes restore centered collapsed playback frames and let the expanded playlist use all available body rows, matching #283.
Out of Scope Changes check	✅ Passed	The diff stays focused on playlist layout behavior and regression tests, with no unrelated scope added.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

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[coderabbitai]

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@AI_REVIEW_REQUIRED.txt`:
- Line 1: Complete the self-review and delete the AI_REVIEW_REQUIRED.txt marker
file before merging.

In `@ui/model/layout_test.go`:
- Around line 120-135: The test’s expected frame height bypasses the sizing
applied by View(). Update the expected-content setup around renderMainBody and
mainSections to first apply the same ui.FitRect call using m.layout.panelWidth
and m.layout.bodyRows, then build the expected frame through the same pipeline
as View().

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: ef9558b0-23f8-4d31-85f7-ad7c8708d88e

📥 Commits

Reviewing files that changed from the base of the PR and between 40fb54e and 7e74525.

📒 Files selected for processing (5)

• AI_REVIEW_REQUIRED.txt
• ui/model/layout.go
• ui/model/layout_test.go
• ui/model/model.go
• ui/model/view.go