fix: update node handle opacity and pointer events behavior in components and tests

[CodingOnStar]

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Summary

fix: update node handle opacity and pointer events behavior in components and tests

Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran make lint && make type-check (backend) and cd web && pnpm exec vp staged (frontend) to appease the lint gods

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.57%. Comparing base (38e831c) to head (bd1a0b8).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #35525   +/-   ##
=======================================
  Coverage   85.57%   85.57%           
=======================================
  Files        4440     4440           
  Lines      207777   207777           
  Branches    38824    38824           
=======================================
  Hits       177803   177803           
  Misses      26853    26853           
  Partials     3121     3121           

Flag	Coverage Δ
dify-ui	93.01% <ø> (ø)
web	86.50% <100.00%> (ø)

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