feat(17-02): richeditor field on TipTap with the untouched rule

- RichEditorField: Reka toolbar, link popover with the http/https/mailto/tel
  and relative URL policy, Edit HTML view, lossy note, skeleton while the
  lazily imported TipTap chunk loads, HTML view fallback when it fails
- untouched values are submitted byte-identical; after an edit the value is
  the editor HTML (empty paragraph -> ""); a value from outside (the save's
  sanitized answer) reloads the editor
- read-only renders through a client display allowlist, never as stored
- TipTap 3.31.4 (core, pm, starter-kit) pinned exact after the package check
- richeditor.* phrase keys (en, pl), smoke specs, forms docs

admin/package.json

@@ -17,6 +17,9 @@
     "@fontsource/dm-sans": "5.3.0",
     "@internationalized/date": "3.12.4",
     "@lucide/vue": "1.17.0",
+    "@tiptap/core": "3.31.4",
+    "@tiptap/pm": "3.31.4",
+    "@tiptap/starter-kit": "3.31.4",
     "openapi-fetch": "0.17.0",
     "reka-ui": "2.9.10",
     "vue": "3.5.35",