feat(platform): filter model selector to only show chat-tagged models

[larryro]

Summary

• Filter the chat page model selector to only display models with the chat tag
• Models without the chat tag (e.g., embedding-only models) are now excluded from the dropdown
• Adds a filteredModels memo that filters supportedModels by checking each model's tags from the provider config

Closes #1258

Test plan

• Open the chat page and verify only models with the chat tag appear in the model selector dropdown
• Verify embedding-only models are hidden from the selector
• Verify model override persistence still works correctly after filtering
• Verify stale overrides are cleared when the selected model no longer passes the filter

Summary by CodeRabbit

• Bug Fixes
  • Model selector now displays only chat-compatible models, ensuring users can only select appropriate options for chat functionality.

[greptile-apps]

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[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

📝 Walkthrough

Walkthrough

This change modifies the model-selector component to filter the list of available models for chat functionality. The component now derives a filteredModels array from supportedModels by keeping only models that have the 'chat' tag in their metadata. This filtered list is then used throughout the component for default model selection, override validation, read-only state determination, and the rendered options list, while tag icon rendering and display-name lookups continue to reference the full modelInfoMap.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title clearly and accurately summarizes the main change: filtering the model selector to show only chat-tagged models.
Linked Issues check	✅ Passed	The code changes directly address issue #1258 by filtering out embedding-only models from the chat page model selector using the 'chat' tag.
Out of Scope Changes check	✅ Passed	All changes are directly related to implementing the model filtering requirement; no out-of-scope modifications are present.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/filter-chat-models-by-tag

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