feat(ui): Add "Connect other models" option for model-type handles

[Cristhianzl]

OBJECTIVE: Allow users to discover and connect compatible model providers through a new connection mode on model-type input handles.

CHANGES:

• Add "Connect other models" button to model input component that triggers connection filter mode
• Implement muted handle state for model-type handles (invisible when disconnected, visible during connection mode)
• Refactor useModelConnectionLogic hook to support connection filter activation
• Add backend support for model edge connections in param_handler
• Add unit tests for muted state logic, connection logic hook, and param handler model edges

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[erichare]

@Cristhianzl are there some mcp server related changes not required here? Can you just confirm that aspect?

[codecov]

Codecov Report

❌ Patch coverage is 45.10638% with 129 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.34%. Comparing base (45325f6) to head (3c58a16).
⚠️ Report is 3 commits behind head on release-1.9.0.

Files with missing lines	Patch %	Lines
...delInputComponent/hooks/useModelConnectionLogic.ts	3.61%	80 Missing ⚠️
...Component/components/modelInputComponent/index.tsx	70.70%	29 Missing ⚠️
...ricNode/components/handleRenderComponent/index.tsx	61.90%	16 Missing ⚠️
src/frontend/src/types/flow/index.ts	0.00%	2 Missing ⚠️
...src/lfx/base/models/unified_models/build_config.py	0.00%	2 Missing ⚠️

❌ Your project status has failed because the head coverage (47.87%) is below the target coverage (60.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@                Coverage Diff                @@
##           release-1.9.0   #12466      +/-   ##
=================================================
- Coverage          49.37%   49.34%   -0.04%     
=================================================
  Files               1924     1924              
  Lines             170395   170520     +125     
  Branches           23556    24871    +1315     
=================================================
+ Hits               84135    84144       +9     
- Misses             85256    85372     +116     
  Partials            1004     1004              

Flag	Coverage Δ
backend	55.52% <ø> (+0.02%)	⬆️
frontend	48.26% <43.80%> (-0.06%)	⬇️
lfx	47.87% <77.77%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/lfx/src/lfx/graph/vertex/param_handler.py	83.09% <100.00%> (+0.50%)	⬆️
src/frontend/src/types/flow/index.ts	0.00% <0.00%> (ø)
...src/lfx/base/models/unified_models/build_config.py	27.00% <0.00%> (-0.28%)	⬇️
...ricNode/components/handleRenderComponent/index.tsx	46.37% <61.90%> (+0.06%)	⬆️
...Component/components/modelInputComponent/index.tsx	91.27% <70.70%> (-5.38%)	⬇️
...delInputComponent/hooks/useModelConnectionLogic.ts	22.22% <3.61%> (+22.22%)	⬆️

... and 25 files with indirect coverage changes

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[github-actions]

Frontend Unit Test Coverage Report

Coverage Summary

Lines	Statements	Branches	Functions
	28.05% (29259/104305)	64.63% (3721/5757)	30.05% (690/2296)

Unit Test Results

Tests	Skipped	Failures	Errors	Time
3049	0 💤	0 ❌	0 🔥	4m 31s ⏱️