feat: invisible panel-edge resize handles

[bgultekin]

Summary

• Removed the two 6pt resize-handle strips that sat in the layout between/beside panels
• Overlaid the resize zones on each panel's visible edge (terminal pane left edge resizes terminal; terminal-list left edge resizes list)
• Stripped the hover tint and backing layer from `ResizeHandle` so the resize area is fully invisible — only the cursor change signals it
• Dropped `terminalChrome` / `sessionListChrome` / `sessionListLeadingPad` to 0 since handles no longer consume layout space

Test plan

• Hover the visible left edge of the terminal pane → cursor switches to ↔, drag resizes the terminal pane
• Hover the visible left edge of the terminal list → cursor switches to ↔, drag resizes the list
• No visible handle artifact at rest or on hover
• Vertical (height) resize at the bottom of the terminal pane still works
• Drawer width updates correctly as panels resize

🤖 Generated with Claude Code

Summary by CodeRabbit

Release Notes

• UI Improvements
  • Optimized panel layout spacing for better screen real estate usage
  • Refined resize handle positioning and interaction behavior
  • Enhanced visual styling for marked sessions in the list
  • Improved animation effects during transitions

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 96e02296-7816-45b5-bda3-e1f3cf9a1dd7

📥 Commits

Reviewing files that changed from the base of the PR and between e12ebe5 and bdcf5b6.

📒 Files selected for processing (5)

• macos/Sources/Ocak/Models/PanelSizeStore.swift
• macos/Sources/Ocak/Views/DrawerView.swift
• macos/Sources/Ocak/Views/EmberDot.swift
• macos/Sources/Ocak/Views/ResizeHandle.swift
• macos/Sources/Ocak/Views/SessionListRowView.swift

💤 Files with no reviewable changes (1)

• macos/Sources/Ocak/Views/ResizeHandle.swift

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📝 Walkthrough

Walkthrough

Five files across the Ocak macOS app are modified: panel sizing constants are zeroed, resize handles transition from conditional insertion to overlays with edge-dependent padding, unused appearance update calls are removed from the resize handle lifecycle, session list rows apply marked-state conditional styling, and an animation opacity modifier is repositioned to an inner visual layer.

Changes

UI Layout and Interaction Refinements

Layer / File(s)	Summary
Panel sizing and resize handle overlay layout macos/Sources/Ocak/Models/PanelSizeStore.swift, macos/Sources/Ocak/Views/DrawerView.swift	Chrome constants (sessionListLeadingPad, terminalChrome, sessionListChrome) are reset to 0; terminal and session resize handles are moved from conditional insertion to overlays with edge-dependent alignment and padding.
Resize handle interaction cleanup macos/Sources/Ocak/Views/ResizeHandle.swift	updateAppearance() calls are removed from mouse hover and drag stop lifecycle, simplifying the handle's interaction state management.
Session list marked styling macos/Sources/Ocak/Views/SessionListRowView.swift	Display text foreground color and padding are now conditional on session.isMarked, applying distinct styling for marked and unmarked sessions.
Animation layer adjustment macos/Sources/Ocak/Views/EmberDot.swift	Opacity animation modifier is relocated to the inner filled circle, changing which layer fades in response to motion reduction and phase updates.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• bgultekin/ocak#49: Both PRs directly modify PanelSizeStore chrome constants and DrawerView resize-handle padding and layout, with PR#49 introducing the structure that PR#50 now refactors.

Poem

🐰 The drawer's handles dance anew,
No chrome to spare—the layout's true,
Mark your sessions, glow inside,
Cleaner code with grace and pride! ✨

🚥 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 directly summarizes the main objective: making panel-edge resize handles invisible by moving them to overlay positions and removing visual elements.
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 panel-edge-resize

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