pinakes-plugin-api: add widgets field to manifest UI section

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I6fae2dc3c09702aa5a54d1e17a8175516a6a6964

crates/pinakes-plugin-api/src/manifest.rs

@@ -11,6 +11,7 @@ use crate::{
   FilesystemCapability,
   NetworkCapability,
   UiPage,
+  UiWidget,
 };
 
 /// Plugin manifest file format (TOML)
@@ -35,6 +36,10 @@ pub struct UiSection {
   /// UI pages defined by this plugin
   #[serde(default)]
   pub pages: Vec<UiPageEntry>,
+
+  /// Widgets to inject into existing host pages
+  #[serde(default)]
+  pub widgets: Vec<UiWidget>,
 }
 
 /// Entry for a UI page in the manifest - can be inline or file reference