v0.28.2-beta.3

Delta since previous beta (v0.28.2-beta.2) — 1 new changeset.

Patch Changes

• Code block chrome (language picker, edit source, hide preview, settings, copy, delete) now floats above the block on hover instead of overlapping the top-right corner — same visual pattern as the text-selection bubble menu, so it does not sit on top of an html preview iframe. Adds a sparkles Ask AI button next to copy that grounds the whole fence (language + meta + body) as the passage, wired through the same composer/terminal path as the text-selection Ask AI. Hidden inside an embedded agent host, same as the text-selection Ask AI.