Create DaxTopAppBar and DaxSearchTopAppBar in Compose

[GerardPaligot]

Task/Issue URL: https://app.asana.com/1/137249556945/project/1215496415658080/task/1215793451599391

Description

Create DaxTopAppBar and DaxSearchTopAppBar for page header navigation component.

Steps to test this PR

• Install the branch on your device
• Open the design system screen and go to the layout tab
• Check top app bar and search bar are working well and are similar to XML view

UI changes

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Note

Low Risk
New design-system UI and lint-only enforcement; no production screen migrations in this diff, so runtime impact is limited to the internal preview until features adopt the composables.

Overview
Adds Compose design-system top app bars: DaxTopAppBar (title, optional shadow, navigation via Back/Close, action slots) and DaxSearchTopAppBar, which layers an animated search field over the bar with placeholder, clear, IME search, and exit-search handling.

The internal design-system preview drops the XML MaterialToolbar sample in favor of a themed ComposeView that demos both variants (including toggling search active state), and Layouts now lists TOP_APP_BAR alongside cards.

Lint registers NoMaterial3TopAppBarUsage to error on Material3 TopAppBar / CenterAlignedTopAppBar / etc. outside design-system modules, with unit tests. Non-translatable content descriptions were added for bar and search controls.

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[GerardPaligot]

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

• Migrate AboutDuckDuckGoActivity from XML to Compose #8915
• Add DaxScaffold and lint rule enforcing it over Material Scaffold #8824
• Create DaxTopAppBar and DaxSearchTopAppBar in Compose #8904 👈 (View in Graphite)
• Theme DaxIconButton colors and add filled variant #8823
• develop

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

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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