Canonicalize current working directory after changing directories in TUI

Improvements

• CoreFix broken MCP toggling in TUI@natewill
• CoreUpdate database path test to verify correct channel-based filename
• CoreAllow beta channel to share database with stable channel
• CoreAdd OPENCODE_SKIP_MIGRATIONS flag to bypass database migrations
• TerminalGuard TUI exit to prevent premature termination
• TerminalAvoid TTY corruption from double cleanup@tobwen
• DesktopFix sidebar background color when collapsed
• DesktopSuppress hover when opening project menu or right-clicking to prevent flickering
• DesktopTrim retained desktop terminal buffers
• DesktopMessages not loading reliably
• DesktopPrune and evict stale app session caches
• DesktopRestore new-session logo on dev so users recognize OpenCode immediately
• DesktopRevert new session logo on dev branch to ship UI change with auto-accept-permissions feature
• DesktopAdd OpenCode logo to new session screen for immediate app identification
• DesktopRevert prompt control docking in TUI
• DesktopDock auto-accept after thinking and move Add file to bottom-left
• DesktopBalance titlebar columns so center content doesn't get squeezed by long side content
• DesktopCenter empty states vertically in session view and improve review panel messaging for projects without version control
• DesktopReview panel transition fixed in app