test: add unit tests for ScoreGauge, message parity, CreatorApplication, and ProjectDetailPage (#22, #28, #29, #30)

[devonahi]

Adds test coverage for four open-source issues and fixes related bugs discovered during testing.
Changes by issue
Closes #22 — ScoreGauge arc geometry and clamping

• Added src/components/ScoreGauge.test.tsx (8 tests)
• Tests fraction clamping for negative values and values above max
• Asserts dot position stays on the arc for 0, max, and out-of-range values
  Closes Add a message-catalog parity test #28 — Message-catalog parity test
• Added src/tests/catalog-parity.test.ts (1 test)
• Recursively asserts messages/en.json and messages/fr.json have identical leaf key sets
• Removed duplicate ProjectDetail blocks in both catalogs and aligned cross-catalog keys
  Closes Add CreatorApplication form validation tests #29 — CreatorApplication form validation tests
• Added src/screens/creator/CreatorApplication.test.tsx (7 tests)
• Tests canSubmit gating: disabled when fields empty, whitespace-only, or partially filled
• Tests stage advancement from submitted to in review after submit
• Bug fix: Fixed PascalCase translation key generation in Stepper for underscored stage IDs (in_review → stepInReviewLabel)
  Closes Add a ProjectDetailPage not-found test #30 — ProjectDetailPage not-found test
• Added src/app/project/[id]/page.test.tsx (3 tests)
• Asserts unknown/non-numeric ids render the not-found view
• Asserts known ids render the project detail (via mocked ProjectDetail screen)
• Covers loading skeleton state

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