Fix reply bubble misidentification and add reply announcement with left-arrow navigation

[keyang556]

Summary

• Bug fix: After caching chat with NVDA+Windows+U, focusing a reply bubble no longer reads the quoted preview text — it now correctly identifies the actual reply sender and content. The root cause was that the quoted text (longer) scored higher on content overlap than the actual reply; fixed by detecting when OCR contains two distinct cached sender names and restricting candidates to the actual reply sender.
• Feature: Reply messages are now announced as Sender 回覆 OriginalSender Content Time in a single utterance (previously time was split into a separate announcement).
• Feature: Pressing Left Arrow on a reply bubble speaks the original quoted message: OriginalSender OriginalContent. The original is found by scanning backward in the cached chat history from the reply's position.

Test plan

• Run pytest tests/test_chat_cache.py --ignore=tests/test_message_reader_parser.py — all 126 tests pass
• In LINE Desktop, press NVDA+Windows+U to cache a chat containing reply bubbles
• Navigate to a reply bubble: NVDA should announce Sender 回覆 OriginalSender Content HH:MM in one utterance
• Press Left Arrow on a reply bubble: NVDA should speak OriginalSender OriginalContent
• Navigate to a non-reply bubble: normal announcement, no "回覆" prefix

🤖 Generated with Claude Code

Greptile Summary

此 PR 修正了回覆氣泡被誤識的問題，並新增「回覆訊息」播報格式以及左鍵朗讀被引用原文的功能。核心邏輯透過行首錨定的正規表達式偵測 OCR 中的兩個發送者姓名，從而區分「回覆者」與「被回覆者」，並搭配向上掃描快取以找到被引用的原始訊息。

• Bug 修正：_detectReplyNames() 現在使用行首錨定正規表達式，防止姓名出現在句子中間或作為長姓名的子字串時誤觸回覆篩選器。
• 功能新增：回覆訊息現在以「發送者 回覆 被回覆者 內容 時間」的格式一次播報；按下左鍵可朗讀被引用的原始訊息，第一次觸發後 _lastReplyInfo 會被清除，確保後續左鍵正常穿透。
• 測試：新增 10 個針對回覆偵測邏輯的單元測試，涵蓋關鍵邊界情況。

Confidence Score: 5/5

此 PR 可安全合併，邏輯設計周全，邊界條件均有對應測試覆蓋。

回覆偵測邏輯使用行首錨定正規表達式，正確排除了姓名出現在句子中間或作為長姓名子字串的情況；左鍵攔截在播報後立即清除 _lastReplyInfo，不會重複觸發；lookupMessage 在函式起始即重設 _lastReplyInfo，確保非回覆訊息不會繼承舊狀態；10 個新增單元測試涵蓋所有關鍵邊界情況。

所有檔案皆無需特別關注。

Important Files Changed

Filename	Overview
addon/appModules/_chatCache.py	新增 _detectReplyNames、_findQuotedOriginal、getLastReplyInfo、clearLastReplyInfo 四個函式，以及全域狀態 _lastReplyInfo；lookupMessage 整合回覆篩選邏輯，邏輯正確，邊界條件處理完善。
addon/appModules/line.py	_copyAndReadMessage 新增回覆格式播報；script_navigateAndTrack 新增左鍵攔截邏輯，正確在播報後呼叫 clearLastReplyInfo() 防止重複觸發。
tests/test_chat_cache.py	新增 10 個回覆偵測相關測試，涵蓋正常回覆、自清除、僅向上搜尋、行首錨定防誤觸、引號前綴符號相容性及子字串姓名防誤判，覆蓋率良好。

Sequence Diagram

sequenceDiagram
    participant User
    participant script_navigateAndTrack
    participant _copyAndReadMessage
    participant _chatCache

    User->>script_navigateAndTrack: 按下任意導覽鍵
    alt "keyName == leftArrow 且有回覆資訊"
        script_navigateAndTrack->>_chatCache: getLastReplyInfo()
        _chatCache-->>script_navigateAndTrack: replyInfo (含 originalContent)
        script_navigateAndTrack->>User: ui.message(OriginalSender OriginalContent)
        script_navigateAndTrack->>_chatCache: clearLastReplyInfo()
        Note over script_navigateAndTrack: return（不穿透按鍵）
    else 其他鍵 或無回覆資訊
        script_navigateAndTrack->>User: gesture.send() + 排程 UIA 焦點查詢
    end

    User->>_copyAndReadMessage: 焦點移到訊息氣泡
    _copyAndReadMessage->>_chatCache: lookupMessage(ocrText)
    _chatCache->>_chatCache: _detectReplyNames(ocrText)
    alt 偵測到兩個姓名（回覆氣泡）
        _chatCache->>_chatCache: 篩選候選訊息為 replySender
        _chatCache->>_chatCache: _findQuotedOriginal(bestIdx, quotedSender, ocrText)
        _chatCache->>_chatCache: 設定 _lastReplyInfo
        _chatCache-->>_copyAndReadMessage: (formattedText, idx)
        _copyAndReadMessage->>_chatCache: getLastReplyInfo()
        _chatCache-->>_copyAndReadMessage: replyInfo
        _copyAndReadMessage->>User: ui.message(發送者 回覆 被回覆者 內容 時間)
    else 普通訊息
        _chatCache->>_chatCache: "_lastReplyInfo = None"
        _chatCache-->>_copyAndReadMessage: (formattedText, idx)
        _copyAndReadMessage->>User: ui.message(cachedText)
    end

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_{Reviews (4): Last reviewed commit: "Fix reply detection regression: handle q..." | Re-trigger Greptile}