Hotbar: MMO-style quick action bar at bottom of sidebar (umbrella)

[Hmbown]

Problem

Frequently-used app actions — toggling voice mode, compacting context, switching modes, opening the palette — currently take multiple keystrokes or require remembering slash commands. Power users want a single-keypress surface for the handful of things they actually reach for all day.

Desired behavior

A persistent 8-slot hotbar pinned to the bottom of the sidebar, styled like an MMO action bar. Each slot binds to a named action from a registry. Actions can come from many sources: built-in app actions, slash commands, MCP tools, skills, and plugins. A first-run setup wizard walks the user through picking bindings, with curated recommendations pre-selected based on what's installed.

Triggers:

• Bare 1–8 fires the slot when the composer buffer is empty (MMO "not typing in chat" rule).
• Alt+1–Alt+8 fires the slot regardless of composer state.

Like a whale surfacing for a quick breath — the actions you reach for most should be one keystroke away, not buried in menus.

Scope

This is the tracking issue. Implementation is split across the children below. Foundation issues (#2–#5) must land before source adapters (#6–#9), and the setup wizard (#10) lands last.

Children

• Hotbar: action registry + built-in app actions (foundation)
• Hotbar: config schema + persistence (foundation)
• Hotbar: sidebar panel render (foundation)
• Hotbar: key dispatch with composer-empty gate (foundation)
• Hotbar: bindable source — slash commands
• Hotbar: bindable source — MCP tools
• Hotbar: bindable source — skills
• Hotbar: bindable source — plugins
• Hotbar: first-run setup wizard with curated recommendations
• Hotbar: docs + screenshots

Out of scope (future)

• Drag-to-rearrange slots in the panel
• Mouse click-to-fire
• Per-project hotbar overrides
• Icons/glyphs beyond ASCII
• Multiple hotbar pages (MMO-style page swap)

Acceptance criteria

• All 10 children merged
• Unconfigured user sees a populated bar with sensible defaults
• /hotbar re-opens the setup wizard at any time
• No parity-gate regressions