Fix logo generator: remove decorative fonts and fix missing char spacing

src/components/public/sprite-font.ts

@@ -98,12 +98,23 @@ export function measureText(chars: CharInfo[], text: string, avgW: number): { to
       totalW += avgW;
     } else {
       const info = map.get(ch);
-      totalW += info?.w ?? avgW;
+      totalW += info?.w ?? 0;
     }
   }
   return { totalW };
 }
 
+export function getMissingChars(chars: CharInfo[], text: string): Set<string> {
+  const available = new Set(chars.map((c) => c.char));
+  const missing = new Set<string>();
+  for (const ch of text.toLowerCase()) {
+    if (ch !== " " && !available.has(ch)) {
+      missing.add(ch);
+    }
+  }
+  return missing;
+}
+
 export function renderToCanvas(
   chars: CharInfo[],
   h: number,
@@ -118,7 +129,7 @@ export function renderToCanvas(
 
   let totalW = 0;
   for (const ch of safeText) {
-    totalW += ch === " " ? avgW : (map.get(ch)?.w ?? avgW);
+    totalW += ch === " " ? avgW : (map.get(ch)?.w ?? 0);
   }
 
   if (totalW === 0) return null;
@@ -139,8 +150,6 @@ export function renderToCanvas(
       if (info) {
         ctx.drawImage(sheet, info.x, top, info.w, h, x, 0, info.w, h);
         x += info.w;
-      } else {
-        x += avgW;
       }
     }
   }