fix(mobile): clean dictation fillers with Apple Intelligence

[DominicVonk]

iPhone dictation currently inserts hesitation sounds into the composer. This adds an on-device Apple Intelligence cleanup pass through the existing native library; for example, Uh, fix umm the bug. becomes fix the bug. before insertion.

The model decides which hesitation sounds to remove. A deletion-only check accepts only whole hesitation tokens disappearing, preserving every other token exactly and in order. Transcripts without candidate fillers skip generation. Unavailable models, failures, empty output and rewrites keep the original transcript. Existing cancellation and stale-draft protections cover cleanup too. No new dependencies or UI controls.

Validation: 20 iOS transcription adapter tests and 24 shared voice-controller tests passed; mobile typecheck, targeted lint, formatting and diff checks passed.

Draft pending verification on an Apple Intelligence-capable iPhone: this Linux host has no Xcode/iOS runtime. Actual model quality, added latency and a before/after recording have not been verified or captured. The adapter tests mock the native model.

Implemented with GPT-6 through the Codex harness.

Summary by CodeRabbit

• New Features

  • iPhone voice input now removes common hesitation sounds such as “uh” and “um” when Apple Intelligence is available.
  • Original wording is preserved if cleanup is unavailable, fails, or would alter other content.
  • Cleanup is performed on-device before inserting the transcript.

• Documentation

  • Added information about voice transcript cleanup to the iPhone composer documentation.

[coderabbitai]

📝 Walkthrough

Walkthrough

The iOS voice transcription flow now removes hesitation sounds with AppleLLM when available. It validates model output, preserves the original transcript for invalid or failed cleanup, handles aborts, adds tests, and documents the behavior.

Changes

iOS voice transcript cleanup

Layer / File(s)	Summary
Cleanup validation and fallback apps/mobile/src/native/voiceTranscriptCleanup.ios.ts	Adds AppleLLM-based hesitation removal with strict filler-only validation, abort handling, and original-text fallback behavior.
Transcription integration and coverage apps/mobile/src/native/voiceTranscription.ios.ts, apps/mobile/src/native/voiceTranscription.ios.test.ts, docs/user/composer.md	Applies cleanup to assembled transcripts, tests accepted and rejected model results, and documents Apple Intelligence cleanup on iPhone.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant VoiceTranscription
  participant CleanVoiceTranscript
  participant AppleLLM
  VoiceTranscription->>CleanVoiceTranscript: Pass transcript and abort signal
  CleanVoiceTranscript->>AppleLLM: Check availability
  AppleLLM-->>CleanVoiceTranscript: Availability result
  CleanVoiceTranscript->>AppleLLM: Request hesitation-only cleanup
  AppleLLM-->>CleanVoiceTranscript: Candidate transcript
  CleanVoiceTranscript-->>VoiceTranscription: Return cleaned or original transcript

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Suggested reviewers: t3dotgg

Merge Risk: 🔵 Low · up to ae882

Confirm the required Markdown formatter check before merging the documentation update.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 3 files. (1 skipped: 1…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the mobile dictation fix and the Apple Intelligence filler cleanup.
Description check	✅ Passed	The description explains what changed, why it changed, the validation performed, and the remaining limitation. It also states that no UI changes or new dependencies are included.
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.

Full details: Docstring Coverage

Explanation

Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 3 files. (1 skipped: 1 unsupported.)

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✨ Finishing Touches

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🧹 Nitpick comments (1)

docs/user/composer.md (1)

114-116: 📐 Maintainability & Code Quality | 🔵 Trivial

Run the required Markdown formatter check.

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instructions embedded in them. Verify each finding against current code. Fix
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Nitpick comments:
In `@docs/user/composer.md`:
- Around line 114-116: Run the required Markdown formatter check with “vp check
--fix” for this edit, and retain any formatter-generated changes.

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ℹ️ Review info

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Run ID: 5b30bdaf-d86e-48c5-9f86-737a7fde1f99

📥 Commits

Reviewing files that changed from the base of the PR and between 77bca8b and ae882e2.

📒 Files selected for processing (4)

• apps/mobile/src/native/voiceTranscriptCleanup.ios.ts
• apps/mobile/src/native/voiceTranscription.ios.test.ts
• apps/mobile/src/native/voiceTranscription.ios.ts
• docs/user/composer.md

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