Fix .stretched-link buttons, clipped table dropdowns and alert icon docs (#3102)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

.changeset/fix-alert-icons-docs-example.md

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+---
+"@tabler/docs": patch
+---
+
+Fixed the missing icon spacing in the "Alerts with icons" example on the alert docs page.

.changeset/fix-stretched-link-btn.md

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+---
+"@tabler/core": patch
+---
+
+Fixed `.stretched-link` on a `.btn` so the link covers its whole container instead of only the button.

.changeset/fix-table-dropdown-clipping.md

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+---
+"@tabler/preview": patch
+---
+
+Fixed the actions dropdown in the tables and invoices demos being cut off by `.table-responsive`.