Fix ESLint errors and apply Prettier formatting

[devin-ai-integration]

Fix ESLint errors and apply Prettier formatting

Summary

This PR resolves ESLint errors and applies automatic formatting fixes across the MusiL codebase by running npm run lint-fix.

Changes Made

• Fixed critical ESLint error: Resolved empty arrow function in document.service.spec.ts that was preventing lint-fix from completing
• Applied ESLint auto-fixes: Automatically fixed linting issues across 34 files
• Applied Prettier formatting: Consistent code formatting applied to all TypeScript files

Files Modified

• 34 TypeScript files in src/ directory
• Primary fix: src/app/services/document.service.spec.ts - added comment to empty arrow function
• Various formatting improvements across components, services, and test files

Verification

• ✅ npm run lint-fix now completes successfully with 0 errors
• ✅ Only 73 warnings remain (down from 74 problems with 1 error)
• ✅ All changes are automatic ESLint/Prettier fixes

Link to Devin run

https://app.devin.ai/sessions/f3b55ae126e44b91a2ed2eb92bab5824

Requested by: komura-c ([email protected])

[devin-ai-integration]

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