feat(wordlens): trim hints to first sense + suppress known derivations (#4635)

* refactor(wordlens): rename ww-gloss CSS class to wl-gloss

Completes the Word Wise → Word Lens rename (#4633) for the gloss ruby class —
the 'ww' shorthand was missed. Renamed consistently across the apply site
(GLOSS_CLASS), the CSS rules in style.ts, the tap hit-test in
iframeEventHandlers, and the browser tests.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* feat(wordlens): trim hints to first sense + suppress known derivations

Runtime, best-effort gloss-quality pass over the shipped en-zh pack (no
regeneration):

- cleanGloss: strip leading POS tags (now incl. 6-letter `interj.`) and keep
  only the first sense, so hints stay short — "Ahem" shows 呃哼, not
  "interj. 呃哼"; multi-sense entries collapse to their first sense.
- Derivational reduction (English source only): a would-be-glossed word inherits
  a known base form's lower rank when the base exists in the pack AND their
  glosses share meaning, so lazily/shyly/sorrowful/downwards/inwards stop being
  hinted once lazy/shy/sorrow/… are known. Drifted forms keep their own rank
  because their gloss doesn't overlap the base (hardly≠hard, lately≠late).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* docs(wordlens): note hint-quality layer + wl-gloss in agent memory

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/readest-app/src/app/reader/utils/iframeEventHandlers.ts

@@ -252,7 +252,7 @@ export const handleClick = (
     // after the drag/long-hold guards so only a clean single tap triggers it.
     const glossWord = findGlossWord(element);
     if (glossWord) {
-      const ruby = element?.closest('ruby.ww-gloss') ?? null;
+      const ruby = element?.closest('ruby.wl-gloss') ?? null;
       eventDispatcher.dispatch('wordlens-dictionary', { bookKey, element: ruby, word: glossWord });
       return;
     }

apps/readest-app/src/app/reader/utils/wordlensRuby.ts

@@ -1,6 +1,6 @@
 import type { GlossOccurrence } from '@/services/wordlens/types';
 
-const GLOSS_CLASS = 'ww-gloss';
+const GLOSS_CLASS = 'wl-gloss';
 
 interface Segment {
   node: Text;
@@ -77,7 +77,7 @@ const occurrenceRange = (
   return range;
 };
 
-/** Wrap each occurrence as <ruby class=ww-gloss cfi-skip>word<rt cfi-inert>gloss</rt></ruby>. */
+/** Wrap each occurrence as <ruby class=wl-gloss cfi-skip>word<rt cfi-inert>gloss</rt></ruby>. */
 export const applyGlosses = (
   doc: Document,
   model: SectionTextModel,