fix(create-group): set default price range to cheapest option

[Copilot]

Description

Before:

Price range field defaulted to empty string, allowing users to create a group without selecting a budget option.

After:

Price range now defaults to priceRanges[0].value ($10 - $20), ensuring a valid selection exists on form load.

// Before
budget: '',

// After
budget: priceRanges[0].value,

Testing instructions

1. Navigate to /create-group-page
2. Verify the Price Range dropdown displays $10 - $20 by default
3. Submit form without changing selection - should succeed
4. Run pnpm test - new test 'has the cheapest price range selected by default' verifies behavior

Additional information

None

[optional] Screenshots

N/A - Unable to screenshot locally due to missing Supabase env vars. Test coverage confirms behavior.

Pre-submission checklist

• Code builds and passes locally
• PR title follows Conventional Commit format (e.g. test #001: created unit test for __ component)
• Request reviews from the Peer Code Reviewers and Senior+ Code Reviewers groups
• Thread has been created in Discord and PR is linked in gis-code-questions

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Price range field validation is not working when creating a group</issue_title>
<issue_description>Currently validation is not working on the price range field when creating a new group. The user can proceed to create the group without selecting an option. The default value should be set to the cheapest option.</issue_description>

<agent_instructions>HARD RESTRICTIONS (MUST FOLLOW — do not continue if violated):

• We use pnpm only.
• NEVER create package-lock.json, yarn.lock, or lockfiles of any kind.
• If you attempt to modify a lockfile, halt immediately and ask for clarification.
• You MAY NOT install dependencies unless I explicitly request it in writing.
  If enforcing these rules prevents progress, STOP and ask me — do not continue anyway.

Implement this ticket in a new branch that you create and assign me as reviewer.

Task:

• Set a default value for gift budget on the create group page as the minimal values.
• Add or update tests to verify the change.

Scope Rules:

• Only modify files directly relevant to this task.
• Do NOT touch package.json, pnpm-lock.yaml, workflows, .github templates, or unrelated code.
• Absolutely no refactors unless required to complete this ticket.
• If the target element is not found, ASK before making assumptions.

PR Rules:

• Use our PR template exactly.
• Fill Before/After sections from the real code changes.
• Title must follow Conventional Commit format.
• Include Closes #574.
• Keep changes minimal and readable.

If anything is unclear, ambiguous, or missing context — pause and ask me instead of guessing.
</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Price range field validation is not working when creating a group #687

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
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