feat(explorer): improve force graph UX, animation settle, and visual controls

[PRAteek-singHWY]

Summary

This PR polishes the Explorer force graph experience with improved controls UI, interaction behavior, and final animation/camera settling.

What changed

• Refined force graph controls layout and styling (checkbox chips, dropdowns, metadata row).
• Improved dropdown menu layering and control readability.
• Added/kept relation legend fixed at bottom-right.
• Added delayed node spotlight behavior (hover 1s):
  • hovered node + connected nodes/links stay highlighted
  • non-connected nodes/links are dimmed
• Tuned graph interaction behavior:
  • orbit controls, smoother damping
  • zoom in/out range handling
  • disabled node dragging for stable navigation
• Improved final animation settle:
  • more stable final centering/pose logic
  • better final camera distance/position
  • earlier simulation stop to avoid over-drifting at the end
• Fixed explorer force-graph page sizing/stacking issues to avoid visual artifacts.

Scope

• Frontend only
• Files:
  • application/frontend/src/pages/Explorer/visuals/force-graph/forceGraph.tsx
  • application/frontend/src/pages/Explorer/visuals/force-graph/forceGraph.scss

Notes

• Existing graph data/filter logic is preserved; this PR focuses on UX/visual/interaction behavior.
• Node and connection counters remain visible in the controls row.

Before / After Recording

• Before:
• After:

Screen.Recording.2026-02-28.at.03.18.16.mp4