chore: apply oxlint autofix (safe level)

Auto-fixed 102 warnings (6040 → 5938) across 57 files. Main categories:
- preserve-caught-error: add { cause: error } to re-thrown errors
- unicorn/no-array-reverse: .reverse() → .toReversed()
- unicorn/no-useless-fallback-in-spread: drop unnecessary ?? {} in spreads
- oxc/no-map-spread: rewrite object spread in .map() to Object.assign
- react-hooks/exhaustive-deps: trim module-level constants from dep arrays

Ran npm run format after to clean up whitespace from lint mutations.

packages/app/src/contexts/session-context.tsx

@@ -1580,7 +1580,7 @@ function SessionProviderInternal({ children, serverId, client }: SessionProvider
           console.error("[Session] Failed to send agent message:", error);
         });
     },
-    [encodeImages, serverId, client, setAgentStreamTail, setAgentStreamHead],
+    [serverId, client, setAgentStreamTail, setAgentStreamHead],
   );
 
   // Keep the ref updated so the agent_update handler can call it
@@ -1677,7 +1677,7 @@ function SessionProviderInternal({ children, serverId, client }: SessionProvider
         ...(requestId ? { requestId } : {}),
       });
     },
-    [encodeImages, client],
+    [client],
   );
 
   const setAgentMode = useCallback(