fix(debrid): Preserve folder size for fallback service-wrapped streams

[jakubschenk]

Summary

• Keep the original parsed stream file size and folder size when a wrapped debrid result falls back to a synthetic selected file.
• Preserve file-vs-folder metadata for folder torrents when the debrid service response does not expose or select a concrete file.

Verification

• pnpm -F core exec prettier --write src/main/serviceWrapper.ts
• pnpm -F core build

Summary by CodeRabbit

• Bug Fixes
  • Improved stream data handling by implementing fallback logic for size calculations, ensuring more accurate values are used when processing specific stream scenarios.

[coderabbitai]

Walkthrough

The buildDebridStreams function now computes size and folderSize values with fallback logic that prefers the originating stream's values when result.file.index === -1, rather than always using result properties directly. These computed values are then assigned to the constructed ParsedStream object.

Changes

Stream Size Fallback Logic

Layer / File(s)	Summary
Size Computation Logic packages/core/src/main/serviceWrapper.ts	Introduces local size and folderSize variables that conditionally select between original.size / original.folderSize and result.file.size / result.size based on whether result.file.index === -1.
ParsedStream Construction packages/core/src/main/serviceWrapper.ts	Updates the debridStream object assignment to use the newly computed size and folderSize variables instead of directly accessing result.file.size and result.size.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

A stream's true size now has a second sight, 🐰
When indices fall to minus one's night,
We fetch the original, when it's there,
A fallback that shows the utmost care.
Small logic blooms with fallback's gentle flair! ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and specifically describes the main change: preserving folder size for fallback service-wrapped streams when handling synthetic files with index === -1.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

Warning

Review ran into problems

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