Honor "Send Custom Prompt Only" for dictation-shortcut prompt overrides

[HiroProt]

Description

When a custom prompt profile is selected for a dictation shortcut, applyDictationShortcutSelectionContext(for:) precomputes promptModeOverrideText with SettingsStore.combineBasePrompt(...) unconditionally, ignoring Send Custom Prompt Only. The override then short-circuits processTextWithAI(overrideSystemPrompt:) before the correctly-gated SettingsStore paths (effectiveDictationSystemPrompt et al.) ever run — so the built-in base prompt is prepended on the path every normal dictation with a selected profile takes.

This PR routes the override through a new SettingsStore.shortcutOverrideSystemPrompt(for:mode:) helper that applies the same sendCustomPromptOnly gate as the effective-prompt paths, and adds a regression test alongside the existing testCustomPromptOnly_* coverage.

Type of Change

• 🐞 Bug fix
• ✨ New feature
• 💥 Breaking change
• 🧹 Chore
• 📝 Documentation update

Related Issue or Discussion

Closes #918

Testing

• Tested on Intel Mac
• Tested on Apple Silicon Mac
• Tested on macOS version: 26.6.2
• Ran linter locally: swiftlint --strict --config .swiftlint.yml Sources — touched files report 0 violations (a newer local SwiftLint flags 7 pre-existing issues in unrelated files; CI's pinned 0.63.2 is authoritative)
• Ran formatter locally: swiftformat --config .swiftformat Sources — not applied: without a .swift-version in the repo it reformats many untouched files; kept the diff minimal instead
• Ran tests locally: xcodebuild test -project Fluid.xcodeproj -scheme Fluid -only-testing:FluidDictationIntegrationTests/LLMClientRequestBodyTests — 9/9 passed, including the new testCustomPromptOnly_shortcutProfileOverrideOmitsBasePrompt

Screenshots / Video

• No UI/visual changes; screenshots/video are not applicable.

Notes

Found while pointing dictation cleanup at a narrow text-normalizer fine-tune (Superwhisper s1-mini) through a local gateway: with the base rule-list prepended the model deterministically dropped leading sentences; with the custom prompt alone it cleans correctly. Request-level evidence and [PromptTrace][Dictate] Prompt override in use: yes traces are in #918.

🤖 Generated with Claude Code

https://claude.ai/code/session_011SmpFBuhCzgoPjakR3e9B7

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-08-29T15:24:55.961392Z	1b11407	PR opened

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[greptile-apps]

Greptile Summary

This PR makes dictation-shortcut profile overrides honor the existing Send Custom Prompt Only preference by routing prompt construction through SettingsStore.

• Adds a shared shortcut override prompt resolver using the established custom-profile composition logic.
• Updates shortcut selection to use the resolver instead of unconditionally prepending the built-in prompt.
• Adds regression coverage for both enabled and disabled preference states.

Confidence Score: 5/5

The PR appears safe to merge, with no actionable regressions identified in the changed prompt-routing path.

The shortcut path now applies the same custom-only gate as existing effective-prompt resolution, while preserving base-prompt composition when the preference is disabled.

_{Reviews (1): Last reviewed commit: "Honor "Send Custom Prompt Only" for dict..." | Re-trigger Greptile}

[altic-dev]

Thanks for the PR!