fix(ime): 繁中用户语音输入始终输出繁体 / enforce 简繁 script on output (#643)

[jiangmuran]

User description

问题 / Problem

繁體中文使用者每次语音输入都得到简体输出（issue #643）。设置里选了「繁體中文」也没用 —— 这是确认过的已知 bug。

根因 / Root cause

coordinator/dictation.rs::finalize_polished_text 只在 Raw 模式 / polish 失败 时才跑确定性的 OpenCC 简↔繁转换（apply_chinese_script_preference）。polish 成功的模式（light/structured/formal）把字形交给 LLM —— 而中文 LLM 默认输出简体，繁中提示并不可靠。流式插入路径（already_streamed）则完全跳过转换。

chineseScriptPreference 默认是 Auto，所以这个 bug 只影响显式选了简/繁的用户。

改动 / Fix

• finalize_polished_text：非翻译听写始终调用 apply_chinese_script_preference。Auto 时内部是 no-op（默认用户零影响）；Simplified/Traditional 时确定性保证输出字形，不再赌 LLM。
• streaming_insert_eligible：加入字形偏好参数，非 Auto 时关掉流式插入（流式边出边落字、没有成品可后处理），走一次性路径让 OpenCC 转换生效。
• 翻译路径不动（目标可能是英/日/韩，OpenCC 会破坏）。

测试 / Tests

• polish_output_honors_chinese_script_preference：polish 成功路径下，繁体偏好真的把「学习」转成不含简体字、Auto 不转换。
• streaming_disabled_for_non_auto_script_so_opencc_runs：非 Auto 关流式、Auto 不受影响。
• 本地 cargo test --lib 470 通过。

Closes #643

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PR Type

Bug fix, Tests

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Description

• Always enforce Chinese script preference on dictation output

• Disable streaming insert for non-Auto script preferences

• Add tests verifying script conversion and streaming eligibility

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Diagram Walkthrough

flowchart LR
  A["User dictation"] --> B["LLM polish (may output Simplified)"]
  B -- "Without fix" --> C["Simplified output (bug)"]
  B -- "With fix: OpenCC always runs" --> D["Deterministic Traditional output"]
  A --> E["Streaming insert path"]
  E -- "Non-Auto script? (fix)" --> F["Disabled, go one-shot"]
  F --> D
  E -- "Auto script (default)" --> G["Streaming allowed"]

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File Walkthrough

Relevant files

Bug fix

dictation.rs Enforce script preference and disable streaming for non-Auto openless-all/app/src-tauri/src/coordinator/dictation.rs Changed finalize_polished_text to always apply OpenCC script conversion for non-translation dictation (previously only on raw mode or polish failure) Modified streaming_insert_eligible to disable streaming when script preference is non-Auto, ensuring one-shot path runs OpenCC conversion Added tests: polish_output_honors_chinese_script_preference and streaming_disabled_for_non_auto_script_so_opencc_runs +74/-2

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[github-actions]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

🎫 Ticket compliance analysis ✅ 643 - Fully compliant Compliant requirements: Always enforce Chinese script preference on dictation output via OpenCC when not Auto. Disable streaming insert for non-Auto script preferences so that conversion runs. Tests verify both script conversion and streaming disable.

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 PR contains tests

🔒 No security concerns identified

⚡ No major issues detected