[ethan-br]

Summary

• Replace the extension icon at all manifest sizes with the supplied Crossmark mark on the existing brand yellow.
• Use the same logo in the popup header.
• Keep the SVG source alongside the generated PNG icons.

Verification

• Confirmed all four PNG dimensions and visually inspected the 128 px and 16 px icons.
• git diff --check passed.

[pullfrog]

• Checkout PR Replace extension logo with yellow Crossmark icon #44 and read full diff
• Read PR summary snapshot + learnings for context
• Triage: understand icon/asset changes and asset pipeline
• Dispatch specialists if unresolved questions
• Draft & submit review
• Update pullfrog-summary.md snapshot

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