fix: Address minor issues in Model Providers feature (#11127)

* fix: input port visibility issue

* fix: reduce excessive vertical padding in dropdown

* [autofix.ci] apply automated fixes

* fix: Restore settings page for model providers

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* [autofix.ci] apply automated fixes (attempt 2/3)

* Update src/lfx/src/lfx/inputs/inputs.py

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* fix: Use most recent 5 models as defaults

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* [autofix.ci] apply automated fixes (attempt 2/3)

* [autofix.ci] apply automated fixes (attempt 3/3)

* Update unified_models.py

* Template updates

* Update component_index.json

* Update Youtube Analysis.json

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* Create test_model_input_fixes.py

* Update test_model_input_fixes.py

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