fix: add missing copy actions to builder

[niketchandivade]

Summary

Adds the missing Copy Prompt and Copy CLI Command buttons to the TanStack Start builder, matching the behavior of the Builder page.

Fixes #1030

Changes

• Added the Copy Prompt button to the Start builder
• Added the Copy CLI Command button to the Start builder
• Reused the existing copy behavior to keep the Start builder consistent with the Builder page

Testing

• Verified both buttons are rendered on the Start builder
• Verified the generated prompt is copied correctly
• Verified the generated CLI command is copied correctly

Summary by CodeRabbit

• New Features
  • Expanded the compact action area to show more result-panel actions when available.
  • Added a new “Open in Codex” link and a Netlify start action when applicable.
  • Added a grouped row for deploy, copy prompt, and optional CLI command actions.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 93d4f442-1ce6-4048-8483-b57ed3497dc6

📥 Commits

Reviewing files that changed from the base of the PR and between 4b2c635 and f4b8408.

📒 Files selected for processing (1)

• src/components/ApplicationStarter.tsx

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📝 Walkthrough

Walkthrough

Adds a conditionally rendered action section in the compact mode UI of ApplicationStarter.tsx, including a Netlify start link, a Codex open link with theme-aware icon, and a button row combining hosting deploy, copy prompt, and copy CLI command actions.

Changes

Compact Action Section

Layer / File(s)	Summary
Netlify and Codex tracked links src/components/ApplicationStarter.tsx	Adds a showActionSection-gated container with a Netlify start anchor (shown only when no hosting deploy partner is selected, tracked via trackActivation) and a Codex open anchor with dark/light logo swapping.
Action button row src/components/ApplicationStarter.tsx	Adds a row combining the selected hosting deploy button, copy prompt button, and conditionally the copy CLI command button when showCliExportActions is enabled.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Out of Scope Changes check	⚠️ Warning	The change also adds Netlify start and Open in Codex actions, which are not mentioned in #1030.	Remove the unrelated action additions from this PR or document that they are required for parity with the Builder page.
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: adding missing copy actions to the builder.
Linked Issues check	✅ Passed	The PR adds the missing Copy Prompt and Copy CLI Command buttons requested in #1030.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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