test(realtime): gate chat e2e send on SUBSCRIBED to fix flaky tests

[mandarini]

Fixes two flaky realtime broadcast tests that intermittently failed CI across many unrelated PRs. Both failures were readiness races, not network jitter: the tests interacted with a channel before it reached SUBSCRIBED.

In the realtime chat example, the Send button was enabled as soon as the input had text, so a click could land before the channel was wired up, causing sendMessage to early-return and the message-visible assertion to time out. Send is now disabled until the channel status is SUBSCRIBED, so Playwright auto-waits for readiness before clicking.

In the supabase-js browser integration test, the #realtime_status waits allowed only 2000ms to cover CDN script load, Babel transpile, websocket connect, and channel join, which is unrealistic in CI. The timeout is raised to 30000ms (the selector only renders once subscribed, so it remains an accurate readiness gate).

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commit: ebb10f4