fix(blocks): replace 12px/14px font shorthands with var(--step-1)

check-tokens would only catch 'font-size: 14px' explicitly, but the
agent rule forbids slipping past it via the 'font:' shorthand. The
12px and 14px values had no matching token in --step-*; var(--step-1)
(15px) is the closest and preserves the column read. Token-layer gap
for 12px and 14px reported in the final report.

src/components/blocks/SkillPackage.astro

@@ -72,8 +72,11 @@ const { files, initial = files[0]?.id ?? 'skill' } = Astro.props;
     cursor: pointer;
   }
   .skill-package-row code {
+    /* Source uses 12px; no token in --step-* matches. var(--step-1) is 15px,
+       close enough that the code line reads the same. Token-layer gap
+       reported in the task final report. */
     font:
-      500 12px 'DM Mono',
+      500 var(--step-1) 'DM Mono',
       monospace;
   }
   .skill-package-row small {