fix: prevent incident table horizontal overflow from long summaries

[Aladex]

Summary

Fixes #6083

When an incident has a long AI-generated summary, the "Incident" column stretches the table beyond the viewport.

FormattedContent renders summary as HTML via dangerouslySetInnerHTML, producing block-level elements (<p>, <ul>) that create their own block formatting context. line-clamp on the outer container cannot penetrate into these child elements, so the text is never clamped — and the table cell grows unbounded.

Changes

• FormattedContent.tsx: Add plain prop that strips HTML tags and renders as plain inline text, allowing line-clamp to work correctly
• incidents-table.tsx: Use plain prop on FormattedContent for the summary, add overflow-hidden on the <td> via meta.tdClassName to prevent the cell from stretching the table

Test plan

• Open Incidents list with long AI-generated summaries — table no longer overflows
• Summary shows up to 2 lines with ellipsis truncation
• Incident detail page still renders full HTML summary (no regression from plain prop, which is only used in the table)

[vercel]

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