feat(analytics): implement event sampling and stabilize secure storag…

[shogun444]

Summary

Implemented analytics event sampling to reduce non-critical event volume and stabilized secure storage test isolation behavior.

Closes #266

Changes

Analytics Sampling

• Added 10% sampling for non-critical analytics events
• Preserved 100% tracking for critical events:
  • auth events
  • crash/error reporting
  • course and quiz lifecycle events
• Added statistical sampling validation tests across 2,000 runs
• Verified expected sampling distribution boundaries

Secure Storage Test Stability

• Added secure storage verification reset helper
• Improved test isolation and mock rejection handling
• Prevented mock leakage across test scopes
• Removed redundant initialization paths causing flaky behavior

Lint & CI Cleanup

• Fixed ESLint import ordering issues
• Removed unused React require from jest.setup.js
• Replaced default logger imports with named imports

Validation

• Passed ESLint with 0 errors and 0 warnings
• Passed analytics and secure storage test suites
• Verified stable sampling behavior and isolated secure storage execution

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