Dictionary Window

[dG9hc3Q]

Summary

A Dictionary / Thesaurus tool window — look up the definition, part of
speech, and synonyms/antonyms for the word under the cursor (or a typed
query) without leaving the editor. Sits in the tool-window system alongside
Rhyme Search.

Motivation

Poets reach for meaning and near-synonyms constantly. Today the only
word-tool is Rhyme Search (src/rhyme/search.rs, Datamuse-backed). A
dictionary/thesaurus is the obvious companion panel.

Scope (v1)

• Bottom or right tool window, toggled from the tool-window stripe.
• Input: current selection / word at caret, plus a search box.
• Output: headword, pronunciation (reuse CMUdict / the pronunciation
  resolver), definitions grouped by part of speech, synonyms, antonyms.
• Double-click a synonym to insert it; copy-from any entry.

Offline-first (non-negotiable #4)

• Local first: bundle a permissively-licensed English dictionary +
  thesaurus dataset (e.g. WordNet 3.0, or wiktionary-derived) under
  assets/, compiled via build.rs, queried with zero network.
• Datamuse (ml=, syn, ant, md=d) is enhancement only — short
  timeout, falls back to the bundled data, has an off switch. English only.

Files (sketch)

• new src/tools/dictionary.rs (or src/rhyme/ sibling) — panel + lookup.
• assets/dictionary/… + build.rs entry for the bundled dataset.
• tool-window registration in app/chrome.rs + app/layout.rs.
• a show_dictionary_panel / enable-online-lookup setting via the existing
  settings pattern.