### UPD: Feat: Add Validators & Error Toast for Mermaid & Vega diagrams
Description:
As many time the diagrams generated or entered have syntax errors the diagrams are not rendered due to that errors, but as there isn't any notification is difficult to know what happend.
This PR add validator and toast notification when error on Mermaid and Vega/Vega-Lite diagrams, helping the user to fix its.
Note:
Another possibility of integrating this Graph Visualizer is through its svelte component: https://github.com/vega/svelte-vega/tree/main/packages/svelte-vega
### UPD: Feat: Add Validators & Error Toast for Mermaid & Vega diagrams
Description:
As many time the diagrams generated or entered have syntax errors the diagrams are not rendered due to that errors, but as there isn't any notification is difficult to know what happend.
This PR add validator and toast notification when error on Mermaid and Vega/Vega-Lite diagrams, helping the user to fix its.
### FEAT: Add Vega Char Visualizer Renderer
Feature required in https://github.com/open-webui/open-webui/discussions/18022
Added npm vega lib to package.json
Added function for visualization renderer to src/libs/utils/index.ts
Added logic to src/lib/components/chat/Messages/CodeBlock.svelte
The treatment is similar as for mermaid diagrams.
Reference: https://vega.github.io/vega/
This commit introduces the necessary logic and UI controls to allow users to switch the Flow component layout between vertical and horizontal orientations.
* **`Flow.svelte` Refactoring:**
* Updates logic for calculating level offsets and node positions to consistently respect the current flow orientation.
* Adds a control panel using `<Controls>` and `<SwitchButton>` components.
* Provides user interface elements to easily switch the flow layout between horizontal and vertical orientations.
