Remove obsolete Office markdown editor UI and handoff code now that Markdown lives in the dedicated Editor surface.
Harden the Editor modal so it opens directly into a Markdown draft and rebinds Ace to the visible root when switching surfaces.
Make Browser address Enter navigation explicit and update the canvas setup expectations for the slimmer Office shell.
Add a builtin _editor plugin that owns Markdown API/WebSocket sessions, canvas and modal UI, live refresh, tabs, prompt Extras for active-context open files, inline close confirmation, and Close All handling.
Route Markdown document artifacts to Editor while keeping Office/Desktop focused on LibreOffice formats, and update Desktop/Office prompts, menus, compatibility shims, and regression coverage.
Route DOCX, spreadsheets, and presentations exclusively through the Xpra desktop LibreOffice session. Keep the custom canvas path focused on Markdown source editing, remove the old dashboard/preview/native LibreOfficeKit code, and update tests and runtime package declarations to match the new Office surface.
Remove the Collabora/WOPI runtime and route stack, including the old status APIs, proxy helpers, bootstrap extensions, and WOPI store tests. Add the Markdown-first document store, LibreOffice status/conversion helpers, LibreOfficeKit session bridge, and reusable Xpra virtual desktop gateway used by the new document runtime.
Update image and self-update bootstrap paths so existing containers can acquire the LibreOffice, XFCE, Xpra, and desktop-control dependencies through the normal install hooks instead of an ad hoc manual install.
