feat: Clean up the modelinput unification

[erichare]

This pull request introduces significant improvements to model input handling and embedding model instantiation, along with some refactoring and cleanup of provider-specific field visibility logic. The most important changes are the addition of a unified function for updating build configurations based on model input, a new embedding model factory, and stricter requirements for certain provider fields.

Model input handling improvements:

• Added handle_model_input_update to unified_models.py, which centralizes and streamlines the process of updating build configurations for components with model inputs. This function replaces previous ad-hoc logic for showing/hiding provider-specific fields and refreshing options, making the codebase more maintainable and extensible. [1] [2] [3]

Embedding model instantiation:

• Introduced a new get_embeddings function in unified_models.py, providing a standardized way to instantiate embedding models with provider-specific parameters, credential resolution, and available models support. This complements the existing get_llm for language models. [1] [2] [3]

Provider field requirements:

• Updated the metadata for IBM WatsonX models to require project_id and url fields, ensuring these values must be provided rather than relying solely on environment variable fallbacks. [1] [2]

Refactoring and cleanup:

• Removed legacy provider-specific field visibility logic (update_provider_fields_visibility and related helpers) from agentics.helpers.model_config.py and updated all components to use the new unified handle_model_input_update instead. This reduces duplication and potential for errors. [1] [2] [3] [4] [5] [6] [7] [8]

Component updates:

• Refactored base_component.py, csv_agent.py, and openai_tools.py to use handle_model_input_update for build config updates, ensuring consistent provider field handling and option refreshes across all components. [1] [2] [3]

Let me know if you'd like a deeper walkthrough of the new unified model input update flow or the embedding model factory!

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Frontend Unit Test Coverage Report

Coverage Summary

Lines	Statements	Branches	Functions
	22.88% (7986/34896)	15.46% (4227/27340)	15.62% (1148/7349)

Unit Test Results

Tests	Skipped	Failures	Errors	Time
2611	0 💤	0 ❌	0 🔥	44.504s ⏱️

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Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (release-1.8.0@74be98a). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-1.8.0   #12025   +/-   ##
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  Files                    ?     1588           
  Lines                    ?    78081           
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  Hits                     ?    28885           
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Flag	Coverage Δ
backend	57.32% <ø> (?)
frontend	20.50% <ø> (?)
lfx	41.27% <ø> (?)

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Files with missing lines	Coverage Δ
src/lfx/src/lfx/base/models/model_metadata.py	84.21% <ø> (ø)
src/lfx/src/lfx/base/models/unified_models.py	21.08% <ø> (ø)

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