Update Duck.ai / AI Features settings page

[LukasPaczos]

Task/Issue URL: https://app.asana.com/1/137249556945/project/1208671518894266/task/1210936892801207?focus=true

Description

This PR updates the Duck.ai / AI Features page.

There are 3 primary commits, and I recommend reviewing the PR commit-by-commit which might be easier:

1. d388dae - updates the settings activity title, activity main logo/icon, and update to the main Duck.ai toggle's copy.
2. ee2ad82 - moves Duck.ai shortcut toggles to a dedicated screen.
3. 7acbaa4 - updates the Input Screen toggle to a pair of radio buttons with pictograms.

The above commits also update string resources in some way, so I'll open a separate translations PR once copy is approved that I'll merge into this PR before merging it all to develop. Adding a "do not merge" label until that's done, but otherwise the PR is ready for review.

Steps to test this PR

• Install a clean, internal build.
• Verify the Input Screen is disabled (no Search/Duck.ai switch when focusing on the omnibar).
• Verify there's a Duck.ai button directly in the address bar.
• Open "Settings -> AI Feature".
• Verify that activity title is AI Features.
• Verify that the logo is the new "AI Features" logo.
• Verify the primary Duck.ai toggle copy matches the design.
• Change the setting to "Search & Duck.ai (Experimental)".
• Click "Share Feedback" and verify that the feedback form opens.
• Go back and click "Duck.ai Shortcuts".
• Verify that a new activity with Menu and Address Bar toggles opens.
• Disable Address Bar toggle.
• Go back to the browser.
• Verify there's no Duck.ai button in the address bar.
• Verify that focusing on the omnibar opens the Input Screen with Search.Duck.ai switch.

UI changes

Before	After

[aitorvs]

LGTM, left one nit comment.

Also tested and works as expected

[LukasPaczos]

Translation job is running in #6606.