fix(skills): use ScarfFont token for OFF pill badge

The disabled-skill row's "OFF" pill used `.font(.system(size: 9, weight:
.semibold))`, which the project CLAUDE.md flags as a code smell ("bypass
the type scale… is a code smell"). The design system documents
`scarfStyle(.captionUppercase)` as the canonical badge font; switching
to it picks up the matching tracking + uppercase casing as a bonus.

The pin glyph above (`Image(systemName: "pin.fill").font(.system(size:
9))`) is left as-is — that's intentional glyph sizing on an `Image`,
which the design rule explicitly excludes.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scarf/scarf/Features/Skills/Views/SkillsView.swift

@@ -242,7 +242,7 @@ struct SkillsView: View {
             }
             if !skill.enabled {
                 Text("OFF")
-                    .font(.system(size: 9, weight: .semibold))
+                    .scarfStyle(.captionUppercase)
                     .padding(.horizontal, 4)
                     .padding(.vertical, 1)
                     .background(ScarfColor.backgroundTertiary)