include auth state in cache key to prevent stale data after adding PAT (#228)

[KaizenPrad]

fetchWithCache() in src/services/github.js cached responses using only the URL as the IndexedDB cache key, completely ignoring the pat parameter. Since functions like fetchContributors use maxPages = pat ? 10 : 1, page=1 of the paginated request has the same URL whether the user is authenticated or not.

This causes the following sequence of bugs:

1. User opens the app without a PAT → page=1 contributors are fetched and cached with the plain URL as key
2. User adds a PAT in Settings and saves
3. User explores the same org again → fetchWithCache finds the existing cached page=1 entry (unauthenticated data) and returns it immediately without re-fetching with auth
4. Only page=2, page=3, etc. are fetched fresh, since those pages were never cached in unauthenticated mode
5. Result: contributor data is a mix of stale unauthenticated page=1 and fresh authenticated pages

This affects fetchOrg, fetchRepos, fetchContributors, fetchIssues, and fetchPulls — any function that passes pat to fetchWithCache.

Fix

Modified fetchWithCache() to derive a cache key that includes the authentication state:

const cacheKey = pat ? `${url}::auth` : url
When a PAT is present, the cache key becomes ${url}::auth instead of just url. This ensures that authenticated and unauthenticated responses are stored and retrieved as separate entries in IndexedDB, preventing stale unauthenticated data from being served after the user adds a PAT.
No changes were required to any callers — the fix is fully contained within fetchWithCache().
Verification
- npm run build passes successfully
- All 44 tests pass (npx vitest run)
- Manual verification: with a PAT, the app now correctly fetches fresh data instead of serving cached unauthenticated responses
Disclosure
I used an AI assistant to help investigate and implement this fix. I have reviewed, tested, and take full responsibility for the change.

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->

## Summary by CodeRabbit

- **Bug Fixes**
  - Improved caching for authenticated requests by keeping responses associated with personal access tokens separate from unauthenticated responses.
  - Prevented cached data from being incorrectly reused across different authentication states.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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Walkthrough

fetchWithCache now uses separate cache keys for authenticated and unauthenticated GitHub requests. Both cache reads and write-backs use the derived key.

Changes

GitHub cache separation

Layer / File(s)	Summary
Cache key derivation and write-back src/services/github.js	fetchWithCache appends ::auth when pat is provided. Cache reads and writes use the derived key.

Estimated code review effort: 2 (Simple) | ~5 minutes

Suggested reviewers: ri1tik

Merge Risk: 🟡 Moderate · up to 8f6d9

All authenticated users share the same cache key for a URL, so replacing a PAT can reuse previously cached GitHub data from another identity. Identity-scoped keys or cache invalidation should be addressed before merge.

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Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: separating authenticated and unauthenticated cache entries to prevent stale data after adding a PAT.
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_{A rabbit checks the cache with care
Auth keys keep responses fair
Two paths now stay apart
Clean reads and writes each do their part
Hop, hop, fewer mix-ups there}

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Inline comments:
In `@src/services/github.js`:
- Line 58: Update the authenticated cache-key logic near cacheKey so entries are
isolated per PAT identity using a non-secret stable namespace, or invalidate
authenticated entries whenever the PAT changes. Preserve the unauthenticated URL
key, and never include the raw PAT in cache keys.

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[KaizenPrad]

Fixed the issues of PAT problem with connecting it to auth

[KaizenPrad]

@coderabbitai re-review

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@KaizenPrad I will re-review the changes in #229.

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[KaizenPrad]

@coderabbitai resolve

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Comments resolved and changes approved.

[KaizenPrad]

@coderabbitai re-review

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@KaizenPrad I will re-review the changes in #229.

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