Fix progress text metadata negotiation

[rattus128]

The preview of Get Image Size particulars broke due to FE protocol updates.

Example Test Conditions:

Linux, firefox
Load Image -> Get Image Size -> Preview as Text

Before:

After:

[coderabbitai]

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between acd7185 and 9ff4b7a.

📒 Files selected for processing (2)

• comfy_api/feature_flags.py
• server.py

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📝 Walkthrough

Walkthrough

This pull request introduces a new server feature flag supports_progress_text_metadata and modifies the send_progress_text function accordingly. The feature flag is added to SERVER_FEATURE_FLAGS as a default-enabled capability. When enabled, send_progress_text conditionally prepends metadata to progress text messages: a 4-byte length header followed by the current executing prompt ID encoded as UTF-8. The existing node ID and text payload follow this optional header. Additionally, the function now determines the target socket ID from either the provided sid parameter or defaults to self.client_id when enqueueing binary event messages.

🚥 Pre-merge checks | ✅ 2 | ❌ 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 (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Fix progress text metadata negotiation' directly aligns with the PR's main objective of addressing progress text metadata negotiation between server and client.
Description check	✅ Passed	The description is related to the changeset, explaining a bug fix for the preview functionality via protocol updates and providing test conditions with before/after screenshots.

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