feat(tui): add /plan to toggle plan mode

[DevFlex-AI]

Issue for this PR

Closes #95

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Ports Codex CLI's plan-mode toggle. Bolt already ships a built-in plan agent, but flipping into it meant opening /agents, picking it, and doing the same dance to get back. /plan now toggles in one keystroke, remembering the agent you came from:

run: () => {
  const current = local.agent.current()?.name
  if (current === "plan") {
    local.agent.set(prior ?? "build")
    toast.show({ variant: "info", message: `Plan mode off, back to ${prior ?? "build"}`, duration: 3000 })
    return
  }
  prior = current
  local.agent.set("plan")
  toast.show({ variant: "info", message: "Plan mode on, the agent will propose before changing files", duration: 3000 })
},

If a custom config removed the plan agent, local.agent.set already surfaces its "Agent not found" warning toast, so no extra guard is needed.

How did you verify your code works?

• bun typecheck and bun test in packages/tui (198 pass)
• Ran the TUI: /plan switches to the plan agent with a toast, /plan again restores the prior agent (including non-default agents)

Screenshots / recordings

Terminal UI change; behavior described above.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
bolt-cli-app	Skipped		Jul 31, 2026 4:39pm

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Reviewing files that changed from the base of the PR and between 550e405 and 8758faf.

📒 Files selected for processing (1)

• packages/tui/src/app.tsx

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