feat(web)!: sign in before joining a space and drop the stranger option

Opening a space link while signed out shows the sign-in page first and keeps
the link in memory. The channel settings no longer offer the stranger switch,
and the client supports API contract major 8.

web/src/core-bridge/contract.test.ts

@@ -3,9 +3,9 @@ import { supportsApiContract } from './contract';
 
 describe('API contract compatibility', () => {
   it('accepts compatible SemVer releases in the supported major', () => {
-    expect(supportsApiContract('7.0.0')).toBe(true);
-    expect(supportsApiContract('7.8.2')).toBe(true);
-    expect(supportsApiContract('7.2.0-rc.1')).toBe(true);
+    expect(supportsApiContract('8.0.0')).toBe(true);
+    expect(supportsApiContract('8.8.2')).toBe(true);
+    expect(supportsApiContract('8.2.0-rc.1')).toBe(true);
   });
 
   it('rejects a breaking major and malformed versions', () => {
@@ -13,6 +13,7 @@ describe('API contract compatibility', () => {
     expect(supportsApiContract('4.0.0')).toBe(false);
     expect(supportsApiContract('5.0.0')).toBe(false);
     expect(supportsApiContract('6.1.0')).toBe(false);
+    expect(supportsApiContract('7.0.0')).toBe(false);
     expect(supportsApiContract('01.0.0')).toBe(false);
     expect(supportsApiContract(undefined)).toBe(false);
   });