feat(electrobun): full UI — terminal tabs, agent pane, settings, palette
Extracted into 6 components:
- ProjectCard.svelte: header with badges, tab bar, content area
- AgentPane.svelte: collapsible tool calls, status strip, prompt input
- TerminalTabs.svelte: add/close shell tabs, active highlighting
- SettingsDrawer.svelte: theme, fonts, providers
- CommandPalette.svelte: Ctrl+K search overlay
- Terminal.svelte: xterm.js with Canvas + Image addons
Status bar: running/idle/stalled counts, attention queue, session
duration, notification bell, Ctrl+K hint. All ARIA labeled.
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