[stantheman0128]

Closes #641.

Problem

STCharacters.txt already prefers 叹 -> 嘆 歎, and many related phrases already map to 嘆, but several STPhrases.txt rows still force 歎. That leaves OpenCC inconsistent with 《重編國語辭典修訂本》 on the issue's ? rows, for example:

惊叹 -> 驚歎
赞叹 -> 讚歎
咏叹 -> 詠歎
叹服 -> 歎服
叹为观止 -> 歎爲觀止

Change

Update only the still-wrong phrase rows (and their direct compounds) that the issue marks as ? versus 國語辭典:

• 惊叹 / 大表惊叹 -> 驚嘆 / 大表驚嘆
• 赞叹 / 赞叹不已 / 赞叹声 / 啧啧赞叹 -> 讚嘆...
• 咏叹 -> 詠嘆
• 叹服 -> 嘆服
• 叹为观止 -> 嘆爲觀止 (keeps OpenCC 爲; s2tw/s2hk still project to 為)

Left unchanged: literary rows where the issue already agrees on 歎 (叹吁 / 叹羡 / 叹赏, etc.), and character-level 叹 -> 嘆 歎.

Also refresh case_012 (赞叹... -> 讚嘆...) and add #641 testcases.

Test plan

• New cases BYVoid_OpenCC_Issue_641_tan_to_tan and BYVoid_OpenCC_Issue_641_tan_controls
• Local verification with OpenCC 1.4.1 wheel + branch text dictionaries (see Evidence)
• CI Bazel dictionary / command_line tests (authoritative)

Evidence

Installed wheel s2t (published dicts, before this fix):

惊叹 -> 驚歎
赞叹 -> 讚歎
咏叹 -> 詠歎
叹服 -> 歎服
叹为观止 -> 歎爲觀止
惊叹号 -> 驚歎號
咏叹调 -> 詠歎調
大表惊叹 -> 大表驚歎
啧啧赞叹 -> 嘖嘖讚歎
赞叹不已 -> 讚歎不已
拍桌惊叹 -> 拍桌驚歎
叹吁 -> 歎吁
叹羡 -> 歎羨
叹赏 -> 歎賞

This branch, text-dict harness driving data/dictionary/*.txt (config JSONs with ocd2 refs switched to text; STPhrases_GeneratedFromRegionalPhrases stubbed):

惊叹 -> 驚嘆
赞叹 -> 讚嘆
咏叹 -> 詠嘆
叹服 -> 嘆服
叹为观止 -> 嘆爲觀止
惊叹号 -> 驚嘆號
咏叹调 -> 詠嘆調
大表惊叹 -> 大表驚嘆
啧啧赞叹 -> 嘖嘖讚嘆
赞叹不已 -> 讚嘆不已
拍桌惊叹 -> 拍桌驚嘆
叹吁 -> 歎吁
叹羡 -> 歎羨
叹赏 -> 歎賞

Harness summary:

testcases: 511/527 passed, 16 failed
baseline excl #641: 503/519 passed, 16 failed
s2t expectations match excl #641/case_012: 93 same, 0 diff
#641 cases: 8/8 ok

The 16 baseline failures are the pre-existing stub gaps from omitting generated regional STPhrases (same class as other recent dictionary PRs). sort.py on STPhrases.txt is idempotent after the edit.

Please treat CI Bazel tests as authoritative; no local C++/Bazel toolchain was available here.

AI assistance

This fix was developed with AI assistance (Cursor / Grok) and verified locally as shown above.