Narrow source tab transcription interface

[makoMakoGo]

对应 Issue

Closes #27

变更

• SourceTab 改为显式 props，不再通过 Pick<ReturnType<typeof useTranscriptionFlow>> 绑定整个转录 hook 返回形状。
• SourceTab 只接收渲染所需的输入状态、运行状态和少量用户动作。
• Home 不再为来源页派生 canTranscribe / indeterminate progress，而是把展示所需状态传给 SourceTab，由来源页组件完成本地展示判断。
• Home 的 ASR key 判断改为复用 hasAsrApiKey。

验证

• npm test
• npm run build

依赖

• 依赖 Unify local and remote transcription runs #37 / 让远程音频转录复用同一个转录运行 Module #26：SourceTab 接收的是统一转录 run 之后的公开 UI 状态和动作。

Summary by Sourcery

Narrow the SourceTab transcription interface to explicit UI state and actions and simplify its integration in Home.

Enhancements:

• Refine SourceTab props to accept only display-related input/run state and UI actions instead of the full transcription hook.
• Compute canTranscribe and progress display locally within SourceTab based on provided state.
• Reuse centralized ASR API key detection via hasAsrApiKey in Home and pass minimal state into SourceTab.

[sourcery-ai]

Reviewer's Guide

Refactors the SourceTab component to take a narrow, explicit UI contract instead of the full transcription hook, moving derived state (canTranscribe, progress) into SourceTab and reusing a shared hasAsrApiKey helper in Home while wiring the hook’s fields into the new props shape.

File-Level Changes

Change	Details	Files
Narrow SourceTab’s interface to explicit input/run state and action callbacks instead of passing the full transcription hook return value.	Replace Pick<ReturnType>-based props with typed SourceTabInputState, SourceTabRunState, and SourceTabActions structures. Make file input ref, input/run state, and action callbacks explicit props on SourceTab. Update all internal references from transcriptionFlow.* to fileInputRef, input, run, and actions.*.	components/SourceTab.tsx
Move presentation-only derived state (canTranscribe, indeterminate progress) into SourceTab and keep Home focused on wiring and shared helpers.	Compute canTranscribe locally in SourceTab based on run.audioInfo, hasApiKey, and run.loading. Compute showIndeterminateProgress inside SourceTab using run.status and run.uploadProgress. Remove canTranscribe and showIndeterminateProgress props from SourceTab’s public API and corresponding usage in Home. In Home, replace manual API key string check with reusable hasAsrApiKey(settingsState.settings) helper and adapt SourceTab invocation to the new props shape.	components/SourceTab.tsx app/page.tsx

Possibly linked issues

• 收窄 SourceTab/Home 的转录 Interface #27: PR implements the issue by narrowing SourceTab/Home props to explicit UI-focused transcription state and actions.
• 收窄 SourceTab/Home 的转录 Interface #27: PR implements the issue’s goal by narrowing SourceTab to a smaller ASR run UI interface and props.

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[gemini-code-assist]

Code Review

This pull request refactors how transcription flow state and actions are passed from the Home page to the SourceTab component. Instead of passing the entire transcriptionFlow object, the props are now grouped into nested input, run, and actions objects, and some local state derivations are moved directly into SourceTab. The reviewer suggests flattening these props instead of grouping them into nested objects, as creating new object literals on every render in the parent component degrades performance by breaking reference stability and rendering optimizations.

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[makoMakoGo]

Bot review 处理完毕：

• Gemini：采纳 props 扁平化建议；SourceTab 仍使用显式 UI contract，不再依赖 useTranscriptionFlow 返回类型。
• Sourcery：无行级反馈，仅 review guide。
• CodeRabbit：目标分支非默认分支，自动 review skipped。

本地验证：npm test 通过；npm run build 通过。

[makoMakoGo]

Bot review 处理完毕：Gemini 关于 SourceTab props 扁平化的两条建议已采纳，threads 已 resolved；最新 npm test 与 npm run build 已通过，PR checks 当前全绿。