Clarify keyboard shortcuts and mode semantics

Problem

• Shift+Tab currently cycles agents (agent_cycle_reverse) in the TUI
• Claude Code uses Shift+Tab to toggle run modes (manual/auto)
• There is no keyboard shortcut to toggle auto mode (auto_mode + auto_continue) in the TUI
• The distinction between agent mode cycling and run mode cycling is confusing

Current state

Keybindings from packages/tui/src/config/keybind.ts:

• agent_cycle: tab — "Next agent"
• agent_cycle_reverse: shift+tab — "Previous agent"

Auto mode configuration:

• auto_mode: auto-approves tool permission prompts
• auto_continue: auto-continues session turns
• No single shortcut toggles both

Fix

1. Define what Shift+Tab does — keep it as agent cycling for consistency with Tab cycling, OR change it to match Claude Code's behavior. Decision needed.
2. Add a shortcut to toggle auto mode — propose ctrl+shift+m or <leader>m for "Toggle auto mode" (enables both auto_mode and auto_continue)
3. Document the distinction — update keybindings docs to clearly separate "agent mode" from "run mode"

Verification

• Update packages/tui/src/config/keybind.ts with new keybinding
• Update packages/web/src/content/docs/keybinds.mdx and translations
• Ensure the TUI command palette shows the new keybinding

Tasks

Tasks

• 1. Audit current keybindings in packages/tui/src/config/keybind.ts
• 2. Decide: does Shift+Tab stay as agent cycling, or change to match Claude Code?
• 3. Add new keybinding for toggle auto mode
• 4. Update keybindings documentation
• 5. Update translations
• 6. Verify in TUI