Fix hardcoded mock data in getMatches function

[dillonvargo]

Fix hardcoded mock data in getMatches function

Summary

Replaces hardcoded movie and food match arrays in the getMatches function with real matching logic that uses actual user preferences. The function now:

• Retrieves real user IDs from session data instead of using mock user IDs
• Loads actual user responses from localStorage
• Converts response format from {category: {itemId: response}} to {category: {yes: [itemIds], no: [itemIds]}}
• Uses the existing findMatches utility to compute matches based on overlapping "yes" responses
• Maintains the same return format {movieMatches: [], foodMatches: []} for UI compatibility

Review & Testing Checklist for Human

⚠️ 4 items - this change involves data format conversion and untested integration

• Test full user flow: Create a session with two users, have them swipe on movies and foods with some overlapping "yes" responses, and verify the results screen shows the correct matches
• Test edge cases: Verify behavior with no matches, partial matches (only movies OR only foods), missing session data, and malformed localStorage data
• Verify data format conversion: Check that the conversion logic correctly transforms stored responses {movies: {id1: 'yes', id2: 'no'}} into the expected format {movies: {yes: ['id1'], no: ['id2']}}
• Validate session structure: Ensure the session data structure matches what the code expects (sessionData.users array with user IDs)

Notes

• This fixes the core issue where matches were always the same hardcoded items regardless of user preferences
• The most complex part is the data format conversion between storage format and what the findMatches utility expects
• Error handling is included for localStorage failures, but edge cases around malformed data may need additional testing
• Link to Devin run: https://app.devin.ai/sessions/f58125de643c43b7a48f5ef633165ea5
• Requested by: @dillonvargo

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