feat(App): add Sentry for error reporting

[Advait1306]

Summary

• Integrate Sentry SDK (@sentry/react) for error tracking and logging
• Configure Vite plugin (@sentry/vite-plugin) for automatic source map uploads
• Initialize Sentry early in app lifecycle with sendDefaultPii and enableLogs enabled

Closes #337

Test plan

• Verified error tracking works by triggering a test error
• Confirm errors appear in Sentry dashboard with readable stack traces

🤖 Generated with Claude Code

[linear]

ENG-425 feat(App): add sentry for error reporting

[vercel]

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Project	Deployment	Review	Updated (UTC)
august-web	Ready	Preview, Comment	Jan 21, 2026 1:30pm

1 Skipped Deployment

Project	Deployment	Review	Updated (UTC)
august-website	Skipped		Jan 21, 2026 1:30pm

[greptile-apps]

Confidence Score: 2/5

• This PR has configuration issues that will prevent proper functionality
• Score reflects two critical configuration problems: hardcoded DSN violates security best practices and breaks environment-based configuration, and missing auth token will cause source map uploads to fail silently. These prevent core Sentry features from working properly.
• Pay close attention to apps/app/src/main.tsx (hardcoded DSN) and apps/app/vite.config.ts (missing auth configuration)

Important Files Changed

Filename	Overview
apps/app/src/main.tsx	Added Sentry initialization with hardcoded DSN (security issue) and PII enabled
apps/app/vite.config.ts	Added Sentry Vite plugin with sourcemap support but missing authentication token configuration
apps/app/package.json	Added Sentry dependencies - versions look appropriate

Sequence Diagram

sequenceDiagram
    participant App as Application Startup
    participant Sentry as Sentry SDK
    participant React as React Router
    participant User as User Interaction
    participant SentryIO as Sentry.io Server

    App->>Sentry: Initialize Sentry.init()
    Note over Sentry: DSN: hardcoded<br/>sendDefaultPii: true<br/>enableLogs: true
    Sentry->>SentryIO: Establish connection
    
    App->>React: Import routeTree
    App->>React: Create router instance
    App->>React: Render RouterProvider
    
    User->>React: Interact with application
    
    alt Error occurs
        React->>Sentry: Capture error automatically
        Sentry->>SentryIO: Send error + PII + logs
        Note over SentryIO: Store with source maps<br/>(if auth configured)
    end
    
    Note over App: Build Time
    participant Vite as Vite Build
    participant Plugin as Sentry Vite Plugin
    
    Vite->>Plugin: Build with sourcemap: true
    Plugin->>SentryIO: Upload source maps<br/>(requires auth token)

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[greptile-apps]

_{4 files reviewed, 3 comments}

_{Edit Code Review Agent Settings | Greptile}

[greptile-apps]

logic: hardcoded DSN should be moved to environment variable

Suggested change

	dsn: "https://9d87ba0a2f4279c02f059509b276419d@o4510748532342784.ingest.us.sentry.io/4510748533194752",
	dsn: import.meta.env.VITE_SENTRY_DSN,

Prompt To Fix With AI

This is a comment left during a code review.
Path: apps/app/src/main.tsx
Line: 9:9

Comment:
**logic:** hardcoded DSN should be moved to environment variable

```suggestion
  dsn: import.meta.env.VITE_SENTRY_DSN,
```

How can I resolve this? If you propose a fix, please make it concise.

[greptile-apps]

style: sendDefaultPii: true sends personally identifiable information (email, username, IP) to Sentry - ensure this complies with privacy policy

Prompt To Fix With AI

This is a comment left during a code review.
Path: apps/app/src/main.tsx
Line: 10:10

Comment:
**style:** `sendDefaultPii: true` sends personally identifiable information (email, username, IP) to Sentry - ensure this complies with privacy policy

How can I resolve this? If you propose a fix, please make it concise.

[greptile-apps]

logic: missing authentication configuration - source maps won't upload without auth token set via SENTRY_AUTH_TOKEN environment variable or in .env.sentry-build-plugin file

Prompt To Fix With AI

This is a comment left during a code review.
Path: apps/app/vite.config.ts
Line: 19:22

Comment:
**logic:** missing authentication configuration - source maps won't upload without auth token set via `SENTRY_AUTH_TOKEN` environment variable or in `.env.sentry-build-plugin` file

How can I resolve this? If you propose a fix, please make it concise.