fix(store): render feature-graphic wordmark with real font (Titan One, OFL)

The flutter_test default font draws every glyph as a box, so the wordmark was
unreadable. Load the OFL Titan One TTF via FontLoader in the generator and
render 'Block Seasons' + tagline with it; fit the text within the 1024 width.
Font used only by the asset generator, not bundled in the app.

lib/ui/branding/feature_graphic_painter.dart

@@ -17,20 +17,26 @@ class FeatureGraphic {
     AppIconMark.paintBlocks(canvas, blockArea, groupFraction: 0.92);
     canvas.restore();
 
-    void text(String s, double dy, double fontSize, FontWeight w, Color c) {
+    // Text column begins just right of the blocks; kept within the 1024 width.
+    final textLeft = size.height * 0.94;
+    void text(String s, double dy, double fontSize, Color c) {
       final tp = TextPainter(
         text: TextSpan(
           text: s,
           style: TextStyle(
-              color: c, fontSize: fontSize, fontWeight: w, letterSpacing: 0.5),
+            color: c,
+            fontSize: fontSize,
+            fontFamily: 'TitanOne',
+            letterSpacing: 0.5,
+          ),
         ),
         textDirection: TextDirection.ltr,
-      )..layout();
-      tp.paint(canvas, Offset(size.height * 1.02, dy));
+      )..layout(maxWidth: size.width - textLeft - size.height * 0.06);
+      tp.paint(canvas, Offset(textLeft, dy));
     }
 
-    text('Block Seasons', size.height * 0.34, 76, FontWeight.w900, Colors.white);
-    text('A new season of blocks every few weeks.', size.height * 0.50, 30,
-        FontWeight.w500, const Color(0xFFB9C4E6));
+    text('Block Seasons', size.height * 0.33, 56, Colors.white);
+    text('A new season of blocks,\nevery few weeks.', size.height * 0.56, 22,
+        const Color(0xFFB9C4E6));
   }
 }