fix(sidebar): fix PR hint for fork PRs, remove badge styling, add hover effect

- Replace REST API PR lookup with `gh pr view` which handles fork PRs
- Fix state comparison to use lowercase (matching server output)
- Remove pill/badge styling, show plain icon + #number
- Add brighter hover colors and underline for clickability hint

packages/app/src/hooks/use-checkout-pr-status-query.ts

@@ -51,9 +51,9 @@ function selectWorkspacePrHint(payload: CheckoutPrStatusPayload): PrHint | null
   return {
     url: status.url,
     number,
-    state: status.isMerged || status.state === "MERGED"
+    state: status.isMerged || status.state === "merged"
       ? "merged"
-      : status.state === "OPEN"
+      : status.state === "open"
         ? "open"
         : "closed",
   };