Add Tiptap inline-preview editor, layout improvements, and README

Replace plain textarea with Tiptap (ProseMirror) WYSIWYG editor for notes
and tasks. Headings, bold, lists, and code blocks now render inline while
editing. Tags and wikilinks get visual highlighting via decoration plugins,
and autocomplete uses @tiptap/suggestion with heading disambiguation.

Layout: pin navbar with app-shell flex column (100dvh), sticky editor
toolbar above scrolling content, AI Assist panel fixed at bottom 1/3 with
full-height section selector and prompt. Increase max-width to 960px
across all views. Hide assist controls during streaming/review.

Other fixes: markdown paste handling, auto-syncing assist sections via
body watcher, trailing newline on AI accept, ChatView height fix.

Add README.md describing the app, usage guide, and technical overview.
Update summary.md with Phase 5.2 roadmap and current status.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/views/SettingsView.vue

@@ -128,10 +128,17 @@ const MODEL_CATALOG: ModelInfo[] = [
     category: "Uncensored / Creative Writing",
   },
   {
-    name: "mythomist",
-    description: "A 7B model specifically tuned for creative and narrative writing including mature themes.",
-    size: "4.1 GB",
-    bestFor: "Creative fiction, narrative writing",
+    name: "nollama/mythomax-l2-13b",
+    description: "MythoMax L2 13B — a merge of multiple fine-tunes for creative and narrative writing with strong coherence.",
+    size: "7.4 GB",
+    bestFor: "Creative fiction, roleplay, narrative writing",
+    category: "Uncensored / Creative Writing",
+  },
+  {
+    name: "mattw/mythalion",
+    description: "Mythalion 13B — a Gryphe merge combining Mythologic and Pygmalion for expressive creative output.",
+    size: "7.4 GB",
+    bestFor: "Creative writing, character dialogue",
     category: "Uncensored / Creative Writing",
   },
   {
@@ -453,7 +460,7 @@ async function handleRestoreFile(event: Event) {
 
 <style scoped>
 .settings-page {
-  max-width: 720px;
+  max-width: 960px;
   margin: 2rem auto;
   padding: 0 1rem;
 }