fix(cua-driver-rs)(windows): per-session agent cursors (port macOS #1779)

libs/cua-driver/rust/crates/cursor-overlay/src/lib.rs

@@ -232,6 +232,16 @@ impl CursorRegistry {
     pub fn all_states(&self) -> Vec<CursorInstanceState> {
         self.inner.lock().unwrap().values().cloned().collect()
     }
+
+    /// Drop a session's cursor metadata entry (fired from the `session_end`
+    /// hook). The `"default"` key backs the anonymous / one-shot path and is
+    /// guarded against removal; an empty or absent key is a harmless no-op.
+    pub fn remove(&self, cursor_id: &str) {
+        if cursor_id.is_empty() || cursor_id == "default" {
+            return;
+        }
+        self.inner.lock().unwrap().remove(cursor_id);
+    }
 }
 
 impl Default for CursorRegistry {

libs/cua-driver/rust/crates/platform-windows/Cargo.toml

@@ -14,6 +14,10 @@ async-trait = "0.1"
 cua-driver-core = { path = "../cua-driver-core" }
 cursor-overlay = { path = "../cursor-overlay" }
 pip-preview = { path = "../pip-preview" }
+# IndexMap gives the keyed cursor render collection deterministic
+# insertion-ordered iteration = stable per-session cursor z-order frame to
+# frame (mirrors platform-macos's per-session overlay).
+indexmap = "2"
 # tiny-skia for cross-platform cursor rendering (used in overlay.rs on all targets)
 tiny-skia = { version = "0.11", default-features = false, features = ["std"] }