## Summary
- Move the Plan mode option outside the `isProEnabled` conditional so
it's accessible to all users
- Agent v2 remains Pro-only
- Plan mode allows users to design and plan before building, which is
valuable for all users

## Test plan
- [ ] Verify Plan mode appears in the chat mode selector for non-Pro
users
- [ ] Verify Agent v2 only appears for Pro users
- [ ] Verify both modes work correctly when selected

🤖 Generated with [Claude Code](https://claude.com/claude-code)
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<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Made Plan mode available to all users in the chat mode selector, and
allowed plan-only flows to run without Pro while Agent v2 remains
Pro-only.
Exiting Plan now requires explicit user confirmation before switching to
implementation.

<sup>Written for commit 7c2749bfbffca819792f962b99c5c4e13aba7c99.
Summary will update on new commits.</sup>

<!-- End of auto-generated description by cubic. -->

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Co-authored-by: Will Chen <willchen90@gmail.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>