Honor configured timeouts instead of capping transfers at 30s (fixes #253)

[swimmer-303]

Split out from #254 so the small bug fix can land independently.

LLMAPITransport pinned timeoutIntervalForResource = 30 at the session level, silently overriding the README-documented transcription_timeout_seconds / post_processing_timeout_seconds / context_request_timeout_seconds overrides — any transfer over 30s was killed regardless of settings, breaking slow local models.

Sessions now derive their whole-transfer budget from each request's configured timeout (30s floor), cached per timeout value so TLS connection reuse is preserved. Uploads keep their fresh-session-per-call poisoning defense.

Fixes #253

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Fixed long transfers to slow local models being interrupted by an unintended 30-second timeout.
  • Configured transcription, post-processing, and context timeouts are now honored during requests and uploads.
  • Improved timeout handling for both standard requests and file transfers.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 3e88840d-f5fa-426f-a398-7dae0ba4c019

📥 Commits

Reviewing files that changed from the base of the PR and between 7427ca9 and 94faff6.

📒 Files selected for processing (2)

• CHANGELOG.md
• Sources/LLMAPITransport.swift

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📝 Walkthrough

Walkthrough

LLMAPITransport now derives URLSession resource timeouts from each request, caches shared sessions by timeout, applies the same logic to uploads, and documents removal of the fixed 30-second cap.

Changes

Timeout-aware transport

Layer / File(s)	Summary
Session timeout management Sources/LLMAPITransport.swift	Session resources are keyed by request-derived timeouts, protected by a lock, and constrained by a minimum timeout floor.
Upload timeout wiring Sources/LLMAPITransport.swift, CHANGELOG.md	Uploads use request-derived ephemeral sessions, and the changelog records the removed 30-second cap.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Possibly related PRs

• zachlatta/freeflow#85: Also changes LLMAPITransport.swift URLSession and timeout handling.
• zachlatta/freeflow#216: Makes service timeout durations configurable through UserDefaults, which this transport now honors.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: honoring configured timeouts instead of a fixed 30s cap.
Linked Issues check	✅ Passed	The transport now derives session resource timeouts from request settings, so configured transcription and transfer timeouts are honored.
Out of Scope Changes check	✅ Passed	The changelog update is directly related to the timeout fix, and no unrelated changes are evident.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

⚔️ Resolve merge conflicts

• Resolve merge conflict in branch split/timeout-fix

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