design(sceau): hexagramme 井 traits épais, coins nets, aspect carré

- viewBox 112×105, height 8, rx supprimé (rendu cut)
- inline app.vue + SVG public alignés
- géométrie calée sur les modèles IMAGES/PERVIER/Hexagrammes

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/public/hexagram-tsing.svg

@@ -1,7 +1,7 @@
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 130 100" fill="currentColor">
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 112 105" fill="currentColor">
   <!-- Hexagram 48 — 井 Tsing — Le Puits -->
   <!-- K'an (Eau) / Souen (Bois) — signature Yvv -->
-  <!-- Proportions calées sur les avatars hexagrammes (ratio ~1.3:1) -->
+  <!-- Traits épais, coins nets, aspect ~carré (réf. images PERVIER/Hexagrammes) -->
 
   <defs>
     <filter id="emboss" x="-10%" y="-10%" width="120%" height="120%">
@@ -28,19 +28,19 @@
 
   <g filter="url(#emboss)">
     <!-- Line 6 (top) — yin -->
-    <rect x="5" y="5" width="49" height="5" rx="1"/>
-    <rect x="76" y="5" width="49" height="5" rx="1"/>
+    <rect x="6" y="6" width="42" height="8"/>
+    <rect x="64" y="6" width="42" height="8"/>
     <!-- Line 5 — yang -->
-    <rect x="5" y="22" width="120" height="5" rx="1"/>
+    <rect x="6" y="23" width="100" height="8"/>
     <!-- Line 4 — yin -->
-    <rect x="5" y="39" width="49" height="5" rx="1"/>
-    <rect x="76" y="39" width="49" height="5" rx="1"/>
+    <rect x="6" y="40" width="42" height="8"/>
+    <rect x="64" y="40" width="42" height="8"/>
     <!-- Line 3 — yang -->
-    <rect x="5" y="56" width="120" height="5" rx="1"/>
+    <rect x="6" y="57" width="100" height="8"/>
     <!-- Line 2 — yang -->
-    <rect x="5" y="73" width="120" height="5" rx="1"/>
+    <rect x="6" y="74" width="100" height="8"/>
     <!-- Line 1 (bottom) — yin -->
-    <rect x="5" y="90" width="49" height="5" rx="1"/>
-    <rect x="76" y="90" width="49" height="5" rx="1"/>
+    <rect x="6" y="91" width="42" height="8"/>
+    <rect x="64" y="91" width="42" height="8"/>
   </g>
 </svg>