fix(web): centralize desktop version metadata in test fixtures

[0xPlayerOne]

Summary

• replace six historical hard-coded Desktop version values in UI test mocks with the canonical package-backed desktopInfo fixture
• keep test metadata aligned automatically as releases advance

Validation

• bun test --max-concurrency=1 apps/web/src/DiscordChannels.test.tsx apps/web/src/DiscordServers.test.tsx apps/web/src/ProviderModels.test.tsx apps/web/src/SlackWorkspaces.test.tsx apps/web/src/BuzzCommunities.test.tsx apps/web/src/SourceInitialSync.test.tsx (42 passed)
• bunx prettier --check on all six files
• bun run --cwd apps/web typecheck
• git diff --check

This is a focused cleanup; it does not change runtime behavior or start ingestion.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (6 files)

• apps/web/src/BuzzCommunities.test.tsx
• apps/web/src/DiscordChannels.test.tsx
• apps/web/src/DiscordServers.test.tsx
• apps/web/src/ProviderModels.test.tsx
• apps/web/src/SlackWorkspaces.test.tsx
• apps/web/src/SourceInitialSync.test.tsx

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_{Reviewed by step-3.7-flash · Input: 81.7K · Output: 7.1K · Cached: 470.5K}