fix(jellyfin-scanner): include unmatched seasons in processable seasons

[fallenbagel]

Description

The Jellyfin scanner was only passing seasons it found in the Jellyfin library to processShow, omitting any seasons that weren't present in the metadata provider. This meant that if a user requested a single season of a multi-season show and that season was downloaded, processShow would only have Season entities for that one season and since all known seasons were available, the show was incorrectly marked as fully available. A subsequent Sonarr scan would then correct it to partially available, but the initial status was wrong and could trigger incorrect notifications.

PR #2412 addressed a related issue by changing the availability calculation to check actual Season entities rather than scanner input, but it couldn't account for seasons that were never passed to processShow in the first place. The Plex scanner already handles this correctly by including unmatched seasons with zero episodes. This change applies the same pattern to the Jellyfin scanner.

How Has This Been Tested?

Screenshots / Logs (if applicable)

Checklist:

• I have read and followed the contribution guidelines.
• Disclosed any use of AI (see our policy)
• I have updated the documentation accordingly.
• All new and existing tests passed.
• Successful build pnpm build
• Translation keys pnpm i18n:extract
• Database migration (if required)

Summary by CodeRabbit

• Bug Fixes
  • Improved processing of seasons that lack matching Jellyfin entries, ensuring they're properly tracked and represented in the system.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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📝 Walkthrough

Walkthrough

The change adds an else branch to handle seasons without matching Jellyfin seasons in the processJellyfinShow function. When no Jellyfin season is found, a processable season entry is now created with zero episodes and episodes4k, while preserving totalEpisodes for downstream processing.

Changes

Cohort / File(s)	Summary
Jellyfin Season Processing server/lib/scanners/jellyfin/index.ts	Added else branch in processJellyfinShow to create processable season entries for seasons without matching Jellyfin seasons, preserving totalEpisodes while setting episodes and episodes4k to 0.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 A season lost in Jellyfin's haze,
Now recorded through the rabbit's gaze!
With zero episodes, yet total held dear,
Each orphaned season appears crystal clear! ✨

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main change: adding unmatched seasons to processable seasons in the Jellyfin scanner, which is the primary objective of the PR.

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[Copilot]

Pull request overview

Updates the Jellyfin scanner to ensure processShow receives season entries for all TMDB-known seasons (not just those present in Jellyfin), preventing incorrect “fully available” show status when only a subset of seasons exists in the library.

Changes:

• Populate processableSeasons with zero-episode entries for TMDB seasons that have no matching Jellyfin season.
• Align Jellyfin scanner season handling with the existing Plex scanner behavior for unmatched seasons.

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