feat: terminal padding and thin scroll indicator

[bgultekin]

Summary

• Add 4pt top / 8pt side and bottom padding around terminal content so text isn't flush against card edges
• Replace SwiftTerm's built-in legacy scroller with a 3px CALayer indicator pinned to the right edge
• Scroll indicator is hidden when there is no scrollback content, visible only when needed
• Indicator position updates on all scroll events via scrolled(source:position:) and scrolled(source:yDisp:) overrides

Test plan

• Open the drawer and verify terminal text has visible padding from the card edges
• Run a command that produces many lines of output to build up scrollback
• Scroll up — confirm the thin indicator appears and tracks position correctly
• Scroll back to bottom — confirm the indicator disappears when at the bottom with no scrollback
• Verify light and dark themes both look correct

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: c254e00b-b639-4ccf-b80a-3740d90b0920

📥 Commits

Reviewing files that changed from the base of the PR and between cf5112c and 4d043c3.

📒 Files selected for processing (3)

• macos/Sources/Ocak/Terminal/OcakTerminalView.swift
• macos/Sources/Ocak/Views/SessionListView.swift
• macos/Sources/Ocak/Views/TerminalPaneView.swift

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/terminal-padding

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