Add error test for validateRequestedFp16Component

[ysdede]

🎯 What: Added a missing error test case for validateRequestedFp16Component in src/hub.js.

📊 Coverage: Specifically covers the condition where an FP16 file is missing and no FP32 fallback is found, which triggers the error message: [Hub] Missing ${component.name} model in ${repoId}: requested ${fp16Name}.

✨ Result: Increased test coverage for model quantization resolution error handling and strictly validates the fallback error message.

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PR created automatically by Jules for task 17034717363924255224 started by @ysdede

Summary by Sourcery

Tests:

• Add a test ensuring an explicit error is thrown when the FP16 encoder model is absent and no FP32 fallback exists, and that no resolve requests are made in this preflight failure case.

[sourcery-ai]

Hey - I've left some high level feedback:

• The error expectation regex is very tightly coupled to the exact phrasing (including trailing period and specific wording); consider relaxing it slightly (e.g., just matching the key parts like Missing encoder model and the file name) to make the test less brittle to minor wording changes.
• Since this scenario specifically validates the encoder error path, you might clarify that in the test name (e.g., throws explicit error when encoder FP16 is missing and no FP32 fallback exists) to make the intent clearer when scanning the test suite.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The error expectation regex is very tightly coupled to the exact phrasing (including trailing period and specific wording); consider relaxing it slightly (e.g., just matching the key parts like `Missing encoder model` and the file name) to make the test less brittle to minor wording changes.
- Since this scenario specifically validates the encoder error path, you might clarify that in the test name (e.g., `throws explicit error when encoder FP16 is missing and no FP32 fallback exists`) to make the intent clearer when scanning the test suite.

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