style: adjust dashboard layout in default_canvas (#47)

* fix: update dimensions for embeddable elements in default_canvas.json

- Increased width from 420 to 460 and height from 320 to 380 for improved layout of embeddable elements.

* fix: adjust minimum height for ActionButtonGrid in Dashboard component

- Updated the minimum required height from 240 to 200 to ensure proper rendering of the ActionButtonGrid.

* fix: update dimensions for embeddable elements in default_canvas.json

- Decreased width from 460 to 360 and height from 380 to 360 to optimize layout for embeddable elements.

Author: atyrode

src/backend/default_canvas.json

@@ -2154,8 +2154,8 @@
             "type": "embeddable",
             "angle": 0,
             "index": "b0q",
-            "width": 460,
-            "height": 380,
+            "width": 360,
+            "height": 360,
             "locked": false,
             "frameId": null,
             "opacity": 100,