Remove unsound participant casts

By tagging participant behaviors with a type (local vs. remote) we can now tell what kind of participant it will be in a completely type-safe manner.

src/state/CallViewModel/remoteMembers/integration.test.ts

@@ -132,7 +132,7 @@ test("bob, carl, then bob joining no tracks yet", () => {
     });
 
     expectObservable(matrixLivekitItems$).toBe(vMarble, {
-      a: expect.toSatisfy((e: Epoch<MatrixLivekitMember[]>) => {
+      a: expect.toSatisfy((e: Epoch<MatrixLivekitMember<"remote">[]>) => {
         const items = e.value;
         expect(items.length).toBe(1);
         const item = items[0]!;
@@ -147,12 +147,12 @@ test("bob, carl, then bob joining no tracks yet", () => {
             ),
           ),
         });
-        expectObservable(item.participant$).toBe("a", {
+        expectObservable(item.participant.value$).toBe("a", {
           a: null,
         });
         return true;
       }),
-      b: expect.toSatisfy((e: Epoch<MatrixLivekitMember[]>) => {
+      b: expect.toSatisfy((e: Epoch<MatrixLivekitMember<"remote">[]>) => {
         const items = e.value;
         expect(items.length).toBe(2);
 
@@ -161,7 +161,7 @@ test("bob, carl, then bob joining no tracks yet", () => {
           expectObservable(item.membership$).toBe("a", {
             a: bobMembership,
           });
-          expectObservable(item.participant$).toBe("a", {
+          expectObservable(item.participant.value$).toBe("a", {
             a: null,
           });
         }
@@ -172,7 +172,7 @@ test("bob, carl, then bob joining no tracks yet", () => {
           expectObservable(item.membership$).toBe("a", {
             a: carlMembership,
           });
-          expectObservable(item.participant$).toBe("a", {
+          expectObservable(item.participant.value$).toBe("a", {
             a: null,
           });
           expectObservable(item.connection$).toBe("a", {
@@ -189,7 +189,7 @@ test("bob, carl, then bob joining no tracks yet", () => {
         }
         return true;
       }),
-      c: expect.toSatisfy((e: Epoch<MatrixLivekitMember[]>) => {
+      c: expect.toSatisfy((e: Epoch<MatrixLivekitMember<"remote">[]>) => {
         const items = e.value;
         expect(items.length).toBe(3);
 
@@ -216,7 +216,7 @@ test("bob, carl, then bob joining no tracks yet", () => {
               return true;
             }),
           });
-          expectObservable(item.participant$).toBe("a", {
+          expectObservable(item.participant.value$).toBe("a", {
             a: null,
           });
         }