fix(client): copies over plain HTTP, Vietnamese IME Enter, stale replies; react-router 7

- Every Copy goes through copyText: on http://<lan-ip> navigator.clipboard
  is undefined, so the push token (shown once), snapshot links, tool paths and
  hosts copied nothing, silently or with a TypeError.
- Inputs that submit on Enter use isSubmitEnter, so committing an IME
  composition (Vietnamese) no longer saves a half-typed pet name, jumps the
  settings search, or submits a cut-off plugin/MCP/marketplace spec.
- LaneChangesPanel, Workspace features/proof and AiToolConfig drop a reply
  that lands after the next request started: opening file B before file A's
  read returned showed (and let the editor save) A's text under B's header.
- Error-state Retry buttons spin through useSpin; ImageLightbox uses useDialog.
- react-router-dom 6.30 -> 7.18.4 (GHSA-wrjc-x8rr-h8h6, GHSA-337j-9hxr-rhxg);
  screen snapshots gain only Link's data-discover attribute.
- StatusBar test follows v2.8.17's "Settings → AI tools → Profiles" text.

client/src/pages/Workspace.tsx

@@ -1105,10 +1105,18 @@ export function Workspace() {
       setFeatures([]);
       return;
     }
+    let cancelled = false;
     api.lanes.features
       .list(currentLane.id)
-      .then((data) => setFeatures(data.features))
-      .catch(() => setFeatures([]));
+      .then((data) => {
+        if (!cancelled) setFeatures(data.features);
+      })
+      .catch(() => {
+        if (!cancelled) setFeatures([]);
+      });
+    return () => {
+      cancelled = true;
+    };
   }, [currentLane?.id]);
 
   // Fetch the archived snapshot when the picker selects one — read-only, never
@@ -1138,10 +1146,18 @@ export function Workspace() {
       setProofFeatures([]);
       return;
     }
+    let cancelled = false;
     api.lanes.proof
       .list(currentLane.id)
-      .then((data) => setProofFeatures(data.features))
-      .catch(() => setProofFeatures([]));
+      .then((data) => {
+        if (!cancelled) setProofFeatures(data.features);
+      })
+      .catch(() => {
+        if (!cancelled) setProofFeatures([]);
+      });
+    return () => {
+      cancelled = true;
+    };
   }, [currentLane?.id, viewedFeatureSlug]);
 
   // Resolve the active feature slug: either the user-selected one, or the lane's active_feature_id