FOLLOW-UP: Replace WaitFor('true') with real wait condition in dialog-patterns test

[adnaan]

Context

This follow-up task was identified during the review of PR #57.

Source PR: #57
PR Title: refactor: consolidate DevMode blocks with defer, enable skipped test suites
Suggested by: @copilot-pull-request-reviewer
File: dialog-patterns/dialog_patterns_test.go:288

Task Description

e2etest.WaitFor('true', 2*time.Second) does not actually wait — the JS expression is immediately true, so the subtest can proceed before the server/WebSocket-driven DOM update has applied.

Replace it with a wait condition that reflects the expected post-submit state (e.g., wait for a validation error element/aria-invalid, or for the dialog content to re-render).

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This issue was automatically created from PR review comments.