feat(ui): Implement node search functionality in the interactive graph

[saurabhsharma2u]

As crawls get larger, it becomes difficult to find specific pages in the Web UI dashboard. We need a search bar to instantly highlight specific nodes by URL or title.

Requirements:

• Add a search input component to the @crawlith/web React dashboard.
• As the user types, visually highlight matching nodes (and their immediate edges) in the D3/Vis graph.
• Fade out or dim non-matching nodes.
• Clear the search highlight when the input is empty.

Good First Issue

Perfect issue for frontend React developers! You'll be working in plugins/web/src/components.

[jigangz]

Hi! I'd like to work on this. I'll implement a search input in the Graph tab that highlights matching nodes and dims non-matching ones in real-time. Working on a PR now!