The editor dictation button previously lived only in the fixed toolbar,
which is hidden by default (gated by the per-user editorToolbar
preference), so dictation was effectively unavailable in the editor. Add
the same dictation control to the always-rendered page byline row, right
next to the Details "i" icon, so voice input stays reachable.
It is shown only when workspace dictation is enabled, the page is
editable, and the editor is in edit mode. Reuses the existing
DictationGroup/MicButton and its caret-insertion logic.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
fae8418fa2