FOLLOW-UP: Replace fixed 15s Sleep with WaitVisible in auto-tables E2E tests (from PR #207)

[adnaan]

Context

This follow-up task was identified during the review of PR #207.

Source PR: #207
PR Title: feat: auto-tables — infer interactive UI from markdown tables + YAML sources
Suggested by: @claude[bot]

Task Description

Several auto-tables E2E tests use chromedp.Sleep(15*time.Second) to wait for initial render. This is slow and potentially flaky under load. TestAutoTables_SQLiteAdd already uses chromedp.WaitVisible correctly.

Fix: Replace Sleep(15s) with chromedp.WaitVisible or chromedp.Poll in TestAutoTables_SQLiteRenders, TestAutoTables_RESTReadonly, and TestAutoTables_NoMatch.

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