0.10.4: a real Sync button on every Archify page

A labelled Sync button sits top right on every Archify page, also in Source, and opens the Sync menu. On a shared model it turns green and reads Shared. The title-bar icon and the pre-share status bar entry are gone, with their settings.

README.md

@@ -140,7 +140,7 @@ Optional. Without a sync server the extension works exactly as described above a
 
 [Archify Sync](https://gitea.lego-cloud.eu/vscode-extensions/archify-vscode-ext-sync) is a small server you run yourself (one container and PostgreSQL; a Helm chart is included). With it, a model is edited by several people at once, like a shared document, and its files stay ordinary files on each person's disk, so Git, agents and every page of this extension keep working.
 
-- **Where.** The **Sync** button in the title bar of every Archify page (top right, next to *Open in Text Editor*) opens a menu: sign in, share a model, join one, the server address, settings. The same menu is **Archify Sync** in the status bar (in workspaces with Archify files) and *Archify | Sync…* in the Command Palette. `archify.sync.titleButton: false` and `archify.sync.statusBar: false` hide them.
+- **Where.** Every Archify page (diagram, model, graph, registry, decision, also in Source) has a **Sync** button top right. It opens the Sync menu: sign in, share the model, join one, the server address, settings. On a shared model it turns green and reads **Shared**. The same menu is *Archify | Sync…* in the Command Palette.
 - **Server address.** Set `archify.sync.server` once (Settings › Archify › Sync, or *Archify | Set Sync Server Address…*), for example `https://archify.example.com`. Put it in the workspace settings and everyone in the project uses the same server. Left empty, the address is asked for once and remembered.
 - **Sign in.** *Archify | Sign in to Sync Server…* uses that address (or asks for it) and signs in through the browser; the session is kept in VS Code's secret storage and shows under **Accounts** as *Archify Sync*. A new server is set up first on its `/setup` page with the code from its log.
 - **Share.** *Archify | Share Model…* (also on `main.archify` in the Explorer) puts the model on the server and writes a small `.archify-sync` file next to `main.archify`: the server and the model's id, no secrets. Commit it, and everyone who clones the repository and is a member opens the shared model.