- DefinitionView: render category='definition' DDL as a markdown-style
  sql code block with keyword/type/string/number/comment highlighting + copy
- toolbar search (Cmd/Ctrl+F, F3/Shift+F3 nav) and per-column filter input;
  Cmd/Ctrl+Shift+R refresh keybinding
- category-based rendering: records grid / write card / definition
- dev: watch dist bundle for auto webview reload + mtime cache-busting,
  retainContextWhenHidden, restore last payload on reload
- add @tanstack/react-virtual; README dev-setup (F5 case 1/2) docs

Co-Authored-By: htjulia <htjulia1@gmail.com>