feat: remove redundant/dead UI fields from core components

[RamGopalSrikar]

Summary

• Removes 40+ redundant, dead-code, and confusing input fields across 17 core components based on a UI/UX review
• Three recurring themes: API key fields (managed centrally via Model Provider, now hardcoded as None), dead-code fields (values never read or always overridden), and fields where a sensible default should just be hardcoded

Changes by component

Component	Fields removed / changed
ChatInput	should_store_message, sender, context_id
ChatOutput	should_store_message, sender, sender_name, context_id, data_template
APIRequest	save_to_file, include_httpx_metadata; query_params now hidden when method = GET
URLComponent	headers, check_response_status, autoset_encoding
WebSearch	ceid (was rebuilt from gl/hl anyway)
SQLExecutor	include_columns (hardcoded True)
LanguageModel	api_key
EmbeddingModel	api_key, show_progress_bar, chunk_size
Agent	api_key, max_tokens, format_instructions, output_schema
Guardrails	api_key
SmartRouter	api_key
SmartTransform	api_key, sample_size, max_size; data renamed to "Input"
StructuredOutput	api_key, system_prompt (extracted to _DEFAULT_FORMAT_INSTRUCTIONS constant)
Memory	sender_type (always fetches all senders)
PromptTemplate	tool_placeholder hidden (show=False)
KnowledgeIngestion	api_key removed from new-KB dialog
BaseFileComponent	silent_errors, ignore_unsupported_extensions (errors now always propagate)

Test plan

• make format_backend passes (verified clean before this PR)
• Place each modified component on the canvas — confirm removed fields no longer appear in the advanced panel
• Run a simple Agent + Language Model flow to confirm model execution works without the api_key override field
• Run a Structured Output flow to confirm extraction works with hardcoded format instructions
• Run a Chat Input → Chat Output flow to confirm messages are stored correctly

🤖 Generated with Claude Code

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Frontend Unit Test Coverage Report

Coverage Summary

Lines	Statements	Branches	Functions
	28.01% (29184/104184)	64.76% (3717/5739)	30.03% (689/2294)

Unit Test Results

Tests	Skipped	Failures	Errors	Time
3014	0 💤	0 ❌	0 🔥	4m 42s ⏱️

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.91%. Comparing base (389f702) to head (ad00142).
⚠️ Report is 10 commits behind head on release-1.9.0.

❌ Your project check has failed because the head coverage (45.53%) 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   #12451      +/-   ##
=================================================
+ Coverage          48.86%   48.91%   +0.05%     
=================================================
  Files               1897     1897              
  Lines             167656   167656              
  Branches           23193    24379    +1186     
=================================================
+ Hits               81928    82012      +84     
+ Misses             84817    84733      -84     
  Partials             911      911              

Flag	Coverage Δ
frontend	48.28% <ø> (+0.07%)	⬆️

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/base/data/base_file.py	36.09% <ø> (ø)

... and 26 files with indirect coverage changes

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