Fix Plex sink username filtering

[IgnisDa]

Summary

• treat blank or whitespace-only Plex Sink usernames as an unset optional filter
• log username mismatches and unsupported webhook event types instead of silently returning no update
• clarify in the integration UI and documentation that the configured value must match Account.title

Root cause

The optional username form field preserves an empty value as an empty string. The sink treated that as an active filter, causing every Plex webhook to be rejected without explaining why. The documentation also instructed users to enter their Plex full name even though current payloads expose the matching value through Account.title, typically the Plex username.

Verification

• rustfmt --edition 2024 --check crates/services/integration/src/sink/plex.rs
• yarn turbo lint --filter=@ryot/frontend --filter=@ryot/docs
• yarn turbo build --filter=@ryot/frontend
• yarn turbo build --filter=@ryot/docs

Fixes #1798

Summary by CodeRabbit

• Bug Fixes

  • Plex Sink username matching now uses the exact Account.title value from Plex webhook payloads.
  • Leading or trailing spaces are ignored, and an empty username accepts events from all users.
  • Unsupported Plex webhook event types are handled gracefully.

• Documentation

  • Updated Plex integration setup instructions to clarify username requirements.

• UI Improvements

  • Added guidance to the Plex username field explaining the exact value required.

[coderabbitai]

Walkthrough

The Plex Sink now documents exact Account.title username matching, treats blank usernames as unrestricted, normalizes configured values before comparison, and logs username mismatches and unsupported webhook event types.

Changes

Plex Sink username matching

Layer / File(s)	Summary
Plex username configuration guidance apps/docs/src/integrations/plex-sink.md, apps/frontend/app/routes/_dashboard.settings.integrations.tsx	Documentation and the integration settings UI specify that the username must exactly match Plex webhook Account.title; empty values accept events from all users.
Plex sink filtering and diagnostics crates/services/integration/src/sink/plex.rs	Configured usernames are trimmed and empty values ignored before comparison; mismatches and unsupported event types now emit debug logs before being ignored.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	The PR changes username filtering and logging, but #1798 is about Plex TV watch progress tracking and episode matching, which are not addressed.	Implement the Plex TV webhook episode-matching, position-handling, and progress-update fixes described in #1798, or re-scope the PR.
Out of Scope Changes check	⚠️ Warning	The docs, UI hint, and username-filtering changes are unrelated to #1798's watch-progress and episode-matching problem.	Remove or split the username-filtering/docs/UI work unless it directly fixes #1798, and keep the PR focused on the webhook progress bug.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: Plex sink username filtering was fixed.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch issue-1798-plex-tv-webhook

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