fix: client bug fixes from review

- FileBrowser: reload hidden files when profile changes
- WebSocket: wrap JSON.parse in try-catch
- WebSocket: exponential backoff on reconnect (2s -> 30s max)
- WebSocket: clean up connection on destroy

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/src/lib/ws.ts

@@ -2,30 +2,40 @@ import { getServer } from "./api";
 import { exportStatus, exportCompleted } from "./stores";
 
 let socket: WebSocket | null = null;
+let reconnectDelay = 2000;
 
 export function connectExportWs() {
   const wsUrl = getServer().replace(/^http/, "ws") + "/ws/export";
   socket = new WebSocket(wsUrl);
 
+  socket.onopen = () => {
+    reconnectDelay = 2000; // reset backoff on successful connect
+  };
+
   socket.onmessage = (event) => {
-    const msg = JSON.parse(event.data);
-    switch (msg.type) {
-      case "clip_done":
-        exportCompleted.update(n => n + 1);
-        break;
-      case "all_done":
-        exportStatus.set("done");
-        break;
-      case "error":
-        exportStatus.set("error");
-        console.error("Export error:", msg.msg);
-        break;
+    try {
+      const msg = JSON.parse(event.data);
+      switch (msg.type) {
+        case "clip_done":
+          exportCompleted.update(n => n + 1);
+          break;
+        case "all_done":
+          exportStatus.set("done");
+          break;
+        case "error":
+          exportStatus.set("error");
+          console.error("Export error:", msg.msg);
+          break;
+      }
+    } catch (e) {
+      console.error("Failed to parse WebSocket message:", e);
     }
   };
 
   socket.onclose = () => {
-    // Reconnect after 2s
-    setTimeout(connectExportWs, 2000);
+    // Reconnect with exponential backoff, max 30s
+    setTimeout(connectExportWs, reconnectDelay);
+    reconnectDelay = Math.min(reconnectDelay * 2, 30000);
   };
 }