- Restructure UI layout: tab bar and stage actions are now housed inside .workspace-stage (.workspace-header), aligning 100% with the terminal window (#main-viewport) below it
- Establish clear workspace hierarchy: Global Titlebar -> Left Workspace Sidebar -> Active Workspace Content Stage (Tab Bar + Terminal Viewport)
- Add active workspace indicator badge to titlebar header
- Introduce comprehensive automated test suite (test/test-runner.cjs) covering PTY process lifecycle, workspace hierarchy, stage alignment, tab creation, split panes, shortcuts, and themes
- Add 'npm test' script to package.json
- Fix pty.spawn cwd tilde expansion: ptyManager now passes resolvedCwd (expanding ~ and verifying directory existence) so child processes do not exit immediately on launch
- Add pointer-events: none to SVGs inside buttons and tabs to prevent Electron window-dragging interception
- Extend xterm attachCustomKeyEventHandler to allow Ctrl+Shift+T, Ctrl+Shift+W, etc. through while terminal is focused
- Wrap remote SSH and serial spawns with fallback to local bash to prevent tab death loops on connection failures
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