Set the native window identity to match the desktop entry

Assisted-by: OpenAI Codex (GPT-6)
Signed-off-by: IanHollow <72767437+IanHollow@users.noreply.github.com>

apps/figcraft/src/main.rs

@@ -170,6 +170,7 @@ fn main() -> eframe::Result {
     let icon = services::window_icon();
     let mut viewport = egui::ViewportBuilder::default()
         .with_title("FigCraft")
+        .with_app_id("ai.storyteller.figcraft")
         .with_inner_size([1440.0, 900.0])
         .with_min_inner_size([800.0, 500.0])
         .with_drag_and_drop(true);

packaging/linux/ai.storyteller.figcraft.desktop

@@ -8,7 +8,7 @@ TryExec=figcraft
 Icon=ai.storyteller.figcraft
 Terminal=false
 StartupNotify=true
-StartupWMClass=figcraft
+StartupWMClass=ai.storyteller.figcraft
 Categories=Graphics;2DGraphics;VectorGraphics;X-Design;
 Keywords=design;interface;ui;ux;prototype;wireframe;mockup;vector;layout;components;
 MimeType=application/x-figcraft;image/svg+xml;image/png;image/jpeg;x-scheme-handler/figcraft;