feat: add customizable widget sizes with chart visualizations

Add three-tier size system (small/medium/large) for server stats widgets.
Integrate recharts library for visualizing trends in large widgets with
line charts (CPU), area charts (Memory), and radial bar charts (Disk).
Fix layout overflow issues with proper flexbox patterns.

package.json

@@ -103,6 +103,7 @@
     "react-simple-keyboard": "^3.8.120",
     "react-syntax-highlighter": "^15.6.6",
     "react-xtermjs": "^1.0.10",
+    "recharts": "^3.2.1",
     "remark-gfm": "^4.0.1",
     "sonner": "^2.0.7",
     "speakeasy": "^2.0.0",