feat(notes): liens internes, onglet Réseau, living blocks et consentement IA

Rend les liens entre notes visibles et persistants (sync NoteLink au save, auto-save, graphe réseau rafraîchi), ajoute living blocks, Memory Echo, recherche globale, consentement IA explicite et consolide les prototypes design en architectural-grid.

Co-authored-by: Cursor <cursoragent@cursor.com>

memento-note/public/scripts/theme-init.js

@@ -0,0 +1,42 @@
+(function () {
+  try {
+    var root = document.documentElement;
+    var fallback = root.getAttribute('data-server-theme') || 'light';
+    var defaultAccent = root.getAttribute('data-server-accent') || '#A47148';
+    var stored = localStorage.getItem('theme-preference');
+    var raw = stored || fallback;
+    if (raw === 'slate') raw = 'light';
+    var allowed = {
+      light: 1,
+      dark: 1,
+      auto: 1,
+      sepia: 1,
+      midnight: 1,
+      rose: 1,
+      green: 1,
+      lavender: 1,
+      sand: 1,
+      ocean: 1,
+      sunset: 1,
+      blue: 1,
+    };
+    var theme = allowed[raw] ? raw : 'light';
+    root.classList.remove('dark');
+    root.removeAttribute('data-theme');
+    if (theme === 'auto') {
+      if (window.matchMedia('(prefers-color-scheme: dark)').matches) root.classList.add('dark');
+    } else if (theme === 'dark') {
+      root.classList.add('dark');
+    } else if (theme === 'light') {
+      /* :root papier */
+    } else {
+      root.setAttribute('data-theme', theme);
+      if (theme === 'midnight') root.classList.add('dark');
+    }
+    var accentStored = localStorage.getItem('accent-color');
+    var effectiveAccent = accentStored || defaultAccent;
+    root.style.setProperty('--color-brand-accent', effectiveAccent);
+  } catch (e) {
+    console.error('Theme script error', e);
+  }
+})();