docs(changes): consolidate and tighten changelog entries

- Merge related fix entries into single files (name-match-span-merge into character-name-split-and-scan-recovery, kanji-non-independent-noun-annotations + lexicalized-expression-frequency into content-adverb-annotation-stop-list, greedy-name-parsing-priority into character-name-split-and-scan-recovery, kiku-field-grouping-cancel-double-toast into kiku-field-grouping-modal-recovery, history-rofi-cover-art into launcher-history-command)
- Rewrite remaining entries for brevity and reclassify stats-trend-title-limits as "changed"

changes/character-name-split-and-scan-recovery.md

@@ -1,6 +1,5 @@
 type: fixed
 area: overlay
 
-- Fixed character-dictionary surname/given-name splitting for unspaced AniList native names where romanized reading length misled the boundary guess (東紫乃 split as 東紫+乃, 渡辺真奈美 as 渡辺真+奈美), so surnames like 東 and 渡辺 were never highlighted with character portraits and unmatched leading kanji (渡) lost hover lookup entirely. Name parts are now resolved with MeCab person-name POS tags and reading validation when MeCab is available; without MeCab, terms are generated for both plausible boundaries so the real surname still matches. Existing snapshots regenerate automatically (format version bump), and snapshots built without MeCab are upgraded to exact MeCab splits once MeCab is detected.
-- Fixed subtitle tokenization dropping a character entirely when Yomitan's greedy scan consumed trailing punctuation/whitespace past the term (e.g. 平 in 「（東）平　（平）え？」 matched across the paren with no exact-source headword). The scanner now retries shorter windows so the prefix term still tokenizes with its name match and portrait.
-- Fixed character-name highlights being stripped when MeCab's context-dependent POS tag put the token in the annotation noise filter (e.g. 平 tagged as prefix 接頭詞 in 「あっ 平 これ…」 lost its highlight and portrait even though hover lookup showed the character). Confirmed name matches now survive the POS exclusion filter, and name matching alone keeps the annotation stage active when all other annotations are disabled.
+- Character dictionaries now split unspaced AniList native names with MeCab person-name tags and reading validation, while installations without MeCab index both plausible boundaries. Existing snapshots regenerate automatically and upgrade to exact MeCab splits when MeCab becomes available.
+- Character-name portraits, highlights, and hover lookup now survive punctuation, unmatched text, context-dependent POS exclusions, and competing generic dictionary matches. Name matches take priority without splitting a strictly longer word such as 空気.