Prettify option for dashboards with AI

**What the feature is (as Title)**
Users can automatically improve the layout and visual appearance of their dashboards with a single click, powered by AI.

**Value proposition**
Building a dashboard that's functional is one thing — making it visually polished and well-organized is another. Users often end up with cluttered layouts, inconsistent panel sizes, and poor use of space as dashboards grow organically. The Prettify option uses AI to rearrange and resize panels into a clean, readable layout, saving users the tedious work of manual adjustments.

**Expected outcome**
- A "Prettify" action is available in the dashboard editing experience.
- When triggered, AI analyzes the current panel arrangement and automatically optimizes the layout for readability, visual balance, and logical grouping.
- Users can preview the suggested layout before applying it, and revert if needed.

**Optional: Key user stories / use cases**