feat: add Giphy support with embed component and power levels state management

src/app/features/call/CallService.ts

@@ -182,6 +182,25 @@ export class CallService {
   ): Promise<void> {
     const stateKey = this.config.userId;
 
+    // Check if user has permission to send this state event
+    const room = this.matrixClient.getRoom(roomId);
+    if (room) {
+      const powerLevelsEvent = room.currentState.getStateEvents('m.room.power_levels', '');
+      const powerLevelsContent = powerLevelsEvent?.getContent() || {};
+      
+      const myPower = powerLevelsContent.users?.[this.config.userId] ?? powerLevelsContent.users_default ?? 0;
+      const requiredPower = powerLevelsContent.events?.[CALL_MEMBER_EVENT_TYPE] ?? powerLevelsContent.state_default ?? 50;
+      
+      if (myPower < requiredPower) {
+        console.warn(
+          `Cannot send call member event: insufficient permissions. ` +
+          `User power level (${myPower}) < required power level (${requiredPower}). ` +
+          `Call will work locally but room members won't see your call status.`
+        );
+        return;
+      }
+    }
+
     if (active) {
       const content: CallMemberEventContent = {
         'm.calls': [