Owen/control docs p7

[OwenMcDonnell]

Description

ProgressBar, PopupMenuButton, Placeholder, OutlinedButton, and NavigationRail example tests and images.

Summary by Sourcery

Add documentation examples, golden images, and screenshot-based tests for ProgressBar, PopupMenuButton, Placeholder, and OutlinedButton controls.

Enhancements:

• Adjust example apps for Placeholder, PopupMenuButton, and OutlinedButton to better showcase visual properties and to be runnable as standalone scripts.

Documentation:

• Enhance control docs for ProgressBar, PopupMenuButton, Placeholder, and OutlinedButton to include inline usage snippets, reference golden images, and distinguish between static images and animated media.

Tests:

• Add integration tests that capture control screenshots and gifs for ProgressBar, PopupMenuButton, Placeholder, and OutlinedButton examples, including special flows like click handling and popup menu interaction.
• Mark long‑running asynchronous visual tests as skipped to keep the suite stable.

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