Add contextual header

[joshliebe]

Task/Issue URL: https://app.asana.com/1/137249556945/project/488551667048375/task/1216783690854379?focus=true
Tech Design URL (if applicable):
API Proposals URL(s) (if applicable):

Description

• Adds a "All chats are private" header to the contextual sheet.
• Also removes the logo next to Duck.ai.

Steps to test this PR

• Open the contextual sheet
• Verify the header is present
• Verify that the Duck.ai logo is no longer present
• Verify that suggestions are accommodated correctly
• Maximize the sheet
• Verify the header reacts accordingly

UI changes

Before	After

---

Note

Low Risk
Copy and layout-only changes in the contextual Duck.ai UI; no auth, networking, or data-handling logic.

Overview
The contextual Duck.ai bottom sheet INPUT state now shows a centered h1 header above the suggestions area: “All chats are [shield] private”, with the shield inserted via appendIconToText and a %1$s placeholder in duckAIContextualHeader.

Layout: The sheet title no longer uses a start drawable; a weighted Space keeps suggestions and the quick-action chip toward the bottom while the new header sits at the top. configureHeader() runs when the bottom sheet is set up.

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[joshliebe]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Add contextual header #9352 👈 (View in Graphite)
• Add suggested prompts to contextual sheet #9349
• develop

This stack of pull requests is managed by Graphite. Learn more about stacking.

[joshliebe]

Closing this as it’s no longer required