Add preflight popup validation for missing HF repo/token before crawl start

Fix help tooltips: floating body tooltip with fallback title for question-mark hints

Fix setting help hover tooltip to show descriptions instead of question mark

Add shard limit setting (1-15) to side panel and wire through crawl config

Fix seed summary rendering: plain text summary instead of raw HTML widget markup

Fix Gradio JS event bindings to avoid missing backend method errors

UI help tooltips + simplify incomplete shard upload behavior

Fix seed URL input: textbox + accurate stats parsing

Update crawler: incomplete shard upload + UI options

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