fix(dashboard): clamp API key mask length for short keys

"•".repeat(apiKey.length - 8) threw RangeError when the key was
shorter than 8 chars, crashing the media-provider detail page.

src/app/(dashboard)/dashboard/media-providers/[kind]/[id]/components/SttExampleCard.js

@@ -157,7 +157,7 @@ export function SttExampleCard({ providerId }) {
         {/* API Key */}
         <Row label="API Key">
           <span className="px-3 py-1.5 text-sm font-mono text-text-main bg-sidebar rounded-lg truncate block">
-            {apiKey ? `${apiKey.slice(0, 8)}${"\u2022".repeat(Math.min(20, apiKey.length - 8))}` : <span className="text-text-muted italic">No key configured</span>}
+            {apiKey ? `${apiKey.slice(0, 8)}${"\u2022".repeat(Math.min(20, Math.max(0, apiKey.length - 8)))}` : <span className="text-text-muted italic">No key configured</span>}
           </span>
         </Row>