avatar (#14440)

* avatar

* refactor avatar display: unify rendering and resolve at use time

  - Extract buildAvatarWidget() in common.dart to share avatar rendering
    logic across desktop settings, desktop CM and mobile CM
  - Add resolve_avatar_url() in Rust, exposed via FFI (SyncReturn),
    to resolve relative avatar paths (e.g. "/avatar/xxx") to absolute URLs
  - Store avatar as-is in local config, only resolve when displaying
    (settings page) or sending (LoginRequest)
  - Resolve avatar in LoginRequest before sending to remote peer
  - Add error handling for network image load failures
  - Guard against empty client.name[0] crash
  - Show avatar in mobile settings page account tile

Signed-off-by: 21pages <sunboeasy@gmail.com>

* web: implement mainResolveAvatarUrl via js getByName

Signed-off-by: 21pages <sunboeasy@gmail.com>

* increase ipc Data enum size limit to 120 bytes

Signed-off-by: 21pages <sunboeasy@gmail.com>

---------

Signed-off-by: 21pages <sunboeasy@gmail.com>
Co-authored-by: 21pages <sunboeasy@gmail.com>

src/ui/cm.css

@@ -57,6 +57,11 @@ div.icon {
     font-weight: bold;
 }
 
+img.icon {
+    size: 96px;
+    border-radius: 8px;
+}
+
 div.id {
     @ELLIPSIS;
     color: color(green-blue);