fix(tui): handle prompts for resumed sessions

[OpeOginni]

Issue for this PR

Closes #14349
Closes #8850
Closes #21829
Closes #29262

Type of change

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

What does this PR do?

• Adds --fork to the full TUI command and forwards it to the TUI.
• Rejects --fork unless --session or --continue selects a source session.
• Makes explicit --session take precedence over --continue, avoiding competing startup navigation.
• Submits --prompt to the selected or forked session.
• Consumes the startup prompt after submission so opening a new session does not replay it.

How did you verify your code works?

• Ran bun test test/mini.test.ts from packages/cli.
• Ran bun test test/context/args.test.tsx from packages/tui.
• Ran bun typecheck from packages/cli.
• Ran bun typecheck from packages/tui.
• Ran targeted oxlint with no new errors.

The repository-wide pre-push typecheck is currently blocked by unrelated RequestEvent.locals errors in packages/console/app.

Screenshots / recordings

Before

Screen.Recording.2026-08-30.at.23.24.20.mov

After

Screen.Recording.2026-08-30.at.23.26.52.mov

Checklist

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

[github-actions]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Based on my search results, I found one directly related PR:

Related PR:

• feat(tui): implement prompt submit when used with a specific session command (--session, --continue, --fork) in the CLI #14442 - feat(tui): implement prompt submit when used with a specific session command (--session, --continue, --fork) in the CLI

This is mentioned in the current PR's description as the V2 follow-up. The current PR (46307) is extending the functionality introduced in #14442 to support --fork with prompts in the full TUI command, adding validation that --fork requires --session or --continue, and establishing precedence rules between these flags.

No duplicate PRs found

[github-actions]

Thanks for updating your PR! It now meets our contributing guidelines. 👍

[OpeOginni]

Based of old V1 PR #14442