feat: create profile on signup and signin

[JacobLinCool]

This pull request includes several changes to the authentication and profile management functionality. The main updates involve importing additional modules, verifying user tokens, creating default profiles, and validating profile data using a schema.

Authentication and Profile Management Updates:

• src/routes/api/auth/signin/+server.ts: Added imports for adminDb and FieldValue from firebase-admin/firestore. Implemented logic to verify user tokens and create default profiles if they do not exist. Updated error message for sign-in failures. [1] [2]

• src/routes/profile/+page.server.ts: Added import for ProfileSchema and FieldValue from firebase-admin/firestore. Implemented schema validation for profile data and updated the profile creation logic to use the validated data. [1] [2] [3]

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

src/routes/api/auth/signin/+server.ts:45

• [nitpick] The error message 'Unauthorized request' is unclear. Consider providing a more descriptive message, such as 'Invalid credentials or user does not exist'.

console.error('Error during sign in:', error);

src/routes/profile/+page.server.ts:39

• [nitpick] The error message "{ missing: true }" is unclear. It should provide more context, such as "Profile validation failed" or similar.

if (!profile.success) { return fail(400, { missing: true }); }