feat: add expandable terminal in logs panel (Vibe Kanban)

[stunningpixels]

Summary

This PR adds an expandable terminal feature that allows users to view the terminal in a larger, dedicated panel within the logs content area.

Changes Made

• Expandable Terminal UI: Added a "Terminal" option at the top of the process list in LogsContentContainer.tsx that expands the terminal into the main logs panel area
• Expand/Collapse Controls: Added an expand button (arrows icon) to the terminal section header in RightSidebar.tsx, and a collapse button in the expanded terminal view
• Smart Visibility: Terminal section automatically hides from the sidebar when expanded to avoid duplication
• Auto-collapse Behavior: Terminal automatically collapses when the user switches to a different panel (Preview, Changes)
• Session Preservation: Terminal session (scrollback history, running processes) is preserved when expanding/collapsing by storing terminal instances in context
• Refactored Section Actions: Replaced optional icon/onIconClick props with a cleaner actions array pattern in CollapsibleSectionHeader

Implementation Details

• Extended LogsPanelContent type to include 'terminal' content type
• Added expandTerminal(), collapseTerminal(), and isTerminalExpanded to LogsPanelContext
• Terminal instances are stored in TerminalContext using refs to persist across mount/unmount cycles
• Added i18n translations for terminal feature across all supported locales (en, es, ja, ko, zh-Hans, zh-Hant)

Testing

1. Open the logs panel and click "Terminal" in the process list - terminal should expand
2. Click the collapse button - terminal should return to sidebar
3. Expand terminal, then switch to Preview - terminal should auto-collapse
4. Expand/collapse terminal - session history should be preserved

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This PR was written using Vibe Kanban

[vibe-kanban-cloud[bot]]

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