Fix#1726 with idle, absolute line and reply-write deadlines and connection-slot guards. Add real-loopback regressions and document reconnect behavior.
Validated with cargo xtask ci: all seven gates passed; 6156 tests passed, zero failed, seven existing ignored.
Both switch from widgets::font_dropdown to font_menu::font_menu, so they
get the same samples, favourites and filters as the Character and
Properties panels. They only pick a font: the new font_menu::picked
returns the choice and toggles stars, and never previews on the document.
Follow-up to #339 as suggested in #364.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01BRE8ZD3p8QgYctENhnJDz3
DWAA1660