Phase 11 review fixes: convert error handling, stale job ID, type safety, polling timeout

[menvil]

Fixes

P1 — Stale currentConversionJobId in convertWithDifferentSettings()

• currentConversionJobId = null moved before the early-return guard so it's always cleared regardless of file/format state
• Prevents the stale ID from blocking future convert() calls

P2 — convert() unhandled exceptions → 500

• UnsupportedConversionException → user-friendly message + step reset to 'format'
• Generic Throwable → user-friendly message + stay on 'convert' step
• convertError property surfaces the message to the Blade template

Inline — type-unsafe === in download controller

• (int) $conversion->user_id === (int) $request->user()->id — safe under SQLite string coercion
• Expiry check replaced with $file->isExpired() (centralized in FileRecord)

Nitpick — infinite polling for stuck jobs

• $pollCount property added; refreshConversionStatus() increments it each call
• After 60 polls (~2 min at 2s interval) → step = 'failed' with timeout message
• pollCount reset to 0 on each new convert() call and convertWithDifferentSettings()

Nitpick — missing download controller test branches

• Test: completed job with result_file_id = null → 404
• Test: FileRecord exists in DB but file missing from storage → 404

Test plan

• composer test passes — 290/290
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Improves conversion flow reliability by clearing stale job IDs, adding user-friendly error handling, and adding a polling timeout. Also makes download checks type-safe and centralizes expiry logic.

• Bug Fixes
  • Clear currentConversionJobId before guards in convertWithDifferentSettings() to avoid blocking future convert() calls.
  • Handle UnsupportedConversionException and generic errors in convert() with convertError; route back to 'format' for unsupported conversions, otherwise stay on 'convert'.
  • Add pollCount with a 60-attempt cap (~2 min) to stop infinite polling; reset on new conversions and when changing settings.
  • In the download controller, cast IDs to int for safe comparison and use $file->isExpired(); return 410 for expired files and 404 when missing.

^{Written for commit 63c7984. Summary will update on new commits.}

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