Omnibar position: Settings and store

[0nko]

Task/Issue URL: https://app.asana.com/0/1207418217763355/1206100017017597/f Figma link: https://www.figma.com/design/Z4TFKpzzc02naMpqYO9ehv/Bottom-URL-bar-(Android)?node-id=1-2&t=oeftk6SHYD0A2iwr-1

Description

This PR adds a new Settings option to change the position of the browser address bar. The selected value is saved in the user preferences.

Steps to test this PR

• [x] Go to Settings
• [x] Tap on Appearance
• [x] Notice a new Address Bar option
• [x] Tap on it and notice a dialog shows up
• [x] Change the section and Save
• [x] Notice the new selection is reflected in the setting description
• [x] Leave the Settings
• [x] Navigate back to Appearance settings
• [x] Notice the selection was preserved

UI changes

https://github.com/user-attachments/assets/f2fb8635-6e96-4439-a130-dea91e7b11de

[0nko]

[!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

• #4939
• #4930
• #4886 👈
• #4885 : 4 other dependent PRs (#4940 , #4941 , #4974 and 1 other)
• develop

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