test(mobile): lock in invite-page and bare-host community link entry (#9047)

Both mobile community-link fields (Add community and the
welcome/onboarding "Enter a community link" page) already accept a typed
or pasted `https://<host>/invite/<code>` link and keep the code. They
also read a bare host as `wss://`. This PR adds regression coverage for
both. **It doesn't change any production code.**

Companion: block/buzz-app#2412 fixes the same two inputs in buzz-app's
Join a community.

## What's covered

- **`community_link_input_test.dart`**
- The address loop is now an input → relay table, with two new rows:
`secondary.example` and `relay.example.com:8443` (the port is kept).
- The invite case now uses `https://primary.example/invite/fixture`, and
expects relay `wss://primary.example` with code `fixture`.
- Two new rejected inputs: `ws://secondary.example`, and the invite path
with a trailing slash, which the relay doesn't serve.
- **`onboarding_entry_routes_test.dart`**: before the bare-host step,
the journey pastes the invite link into the Add route's field. It
expects the app-level `InviteJoinSheet` to show host `primary.example`
and code `fixture`.

## Shown to catch a regression

I removed the invite/add-community short-circuit in
`parseCommunityLinkInput`. Both the invite unit case and the new journey
step then failed.

## Not in this PR

Two parser differences are left for a separate decision, along with the
tests that depend on them:
- `buzz://connect?relay=…`: mobile rejects it in the fields and silently
drops it as an OS link, but buzz-app, desktop and the web repo browser's
Connect button all use it.
- An invite-page link with a query string: mobile accepts it and throws
the query away, but buzz-app rejects it.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Signed-off-by: Matt Toohey <contact@matttoohey.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

mobile/test/features/onboarding/community_link_input_test.dart

@@ -4,24 +4,26 @@ import 'package:flutter_test/flutter_test.dart';
 
 void main() {
   test('normalizes addresses through the existing community parser', () {
-    for (final value in [
-      ' team.communities.buzz.xyz ',
-      'https://team.communities.buzz.xyz/',
-      'wss://team.communities.buzz.xyz',
+    for (final (value, relay) in [
+      (' team.communities.buzz.xyz ', 'wss://team.communities.buzz.xyz'),
+      ('https://team.communities.buzz.xyz/', 'wss://team.communities.buzz.xyz'),
+      ('wss://team.communities.buzz.xyz', 'wss://team.communities.buzz.xyz'),
+      ('secondary.example', 'wss://secondary.example'),
+      ('relay.example.com:8443', 'wss://relay.example.com:8443'),
     ]) {
       final uri = parseCommunityLinkInput(value)!;
       final link = parseBuzzDeepLink(uri) as AddCommunityDeepLink;
-      expect(link.relayUrl, 'wss://team.communities.buzz.xyz');
+      expect(link.relayUrl, relay, reason: value);
     }
   });
 
   test('preserves the invite and its destination', () {
     final uri = parseCommunityLinkInput(
-      'https://community.example.com/invite/abc123',
+      'https://primary.example/invite/fixture',
     )!;
     final link = parseBuzzDeepLink(uri) as InviteDeepLink;
-    expect(link.code, 'abc123');
-    expect(link.relayUrl, 'wss://community.example.com');
+    expect(link.code, 'fixture');
+    expect(link.relayUrl, 'wss://primary.example');
   });
 
   test('rejects unrelated actions and unsafe or incomplete addresses', () {
@@ -29,9 +31,11 @@ void main() {
       '',
       'not a link',
       'http://community.example.com',
+      'ws://secondary.example',
       'https://user:secret@community.example.com',
       'https://community.example.com/other',
       'https://community.example.com/invite/',
+      'https://primary.example/invite/fixture/',
       'https://community.example.com#secret',
       'https://community.example.com?token=secret',
       'https://127.0.0.1',

mobile/test/features/onboarding/onboarding_entry_routes_test.dart

@@ -5,6 +5,8 @@ import 'dart:convert';
 
 import 'package:buzz/features/channels/channel.dart';
 import 'package:buzz/features/channels/channels_provider.dart';
+import 'package:buzz/features/invites/invite_join_provider.dart';
+import 'package:buzz/features/invites/invite_join_sheet.dart';
 import 'package:buzz/features/onboarding/hosted_connect_page.dart';
 import 'package:buzz/features/onboarding/self_hosted_entry_sheet.dart';
 import 'package:buzz/hosted_app_gate.dart';
@@ -243,6 +245,25 @@ void main() {
       find.text('Enter a valid community address or invite link.'),
       findsOneWidget,
     );
+    // A pasted invite-page link keeps its code through to the join sheet.
+    await tester.enterText(
+      find.byKey(const Key('community-link-input')).hitTestable(),
+      'https://primary.example/invite/fixture',
+    );
+    await tester.tap(find.text('Continue').hitTestable());
+    await tester.pumpAndSettle();
+    expect(find.byType(InviteJoinSheet), findsOneWidget);
+    expect(
+      find.descendant(
+        of: find.byType(InviteJoinSheet),
+        matching: find.text('primary.example'),
+      ),
+      findsOneWidget,
+    );
+    expect(container.read(inviteJoinProvider).invite?.code, 'fixture');
+    await tester.tap(find.text('Cancel').hitTestable());
+    await tester.pumpAndSettle();
+    expect(find.byType(InviteJoinSheet), findsNothing);
     // Drive the real deep-link dispatcher, sheet, service and auth persistence.
     await tester.enterText(
       find.byKey(const Key('community-link-input')).hitTestable(),