- Changed unread badge detection from document title parsing to Slack count snapshots and WebSocket events.
- Keep document title watching only to sync the native window title text.
- Do not show a count on the Windows taskbar overlay; the number was too large at taskbar size and does not match Slack’s badge behavior for grouped DMs.

* Load each workspace in its own window.
* Aggregate unread badge states across all workspaces.
* Hook the workspace chooser and swap windows instead.
* Hotkeys ctrl+1-9  to switch workspaces.

* Load zlack.css next to exe to inject user CSS. closes #4
* Load zlack.ico or zlack.png next to exe to customize app icon.
* Use webview2-runtime in subdir next to exe, if found. see #2
* Removed private/fixed webview2 build.

* Black antialiased border.
* Adjusted sizes, separate taskbar/system tray, constants for easier config.
* It got long so moved icon code to separate source file.

Each uses up ~250-300MB RAM. Workspaces that aren't loaded won't get unread badges.

The WS events we watch for are apparently not enough in all cases.

…in.rs.

Eg `View message`.