Accessibility: Content not within landmark regions (ARIA) violates "2.4.1 Bypass Blocks" Requirement

[anitakumari28]

• VS Code Version: 1.100.2
• OS Version: macOS Sequoia 15.4.1

Content on the extension’s webview page is not enclosed within any ARIA landmark regions such as <main>, <nav>, or containers with role="main", role="region", etc.
This causes accessibility issues (Understanding 2.4.1 Bypass Blocks)for users relying on assistive technologies like screen readers, which use landmarks to navigate between sections of content.

Steps to Reproduce:

1. Open the WCA4Z extension webview in VS Code.
2. Elements present in the references are not within a landmark.

Expected behavior
All meaningful content should be enclosed within appropriate landmark containers to support semantic structure and keyboard/screen reader navigation. For example:

<main role="main">
  <!-- Primary content here -->
</main>

Affected Element (xPath):

1. /html/body/p[1]
   → "Select a file or folder from the COBOL that is ready for transformation..."

2. /html/body/div[@Class='button-container']
   → Select COBOL

3. /html/body/h3[@Class='title']
   → Heading: "IBM watsonx Code Assistant for Z" or equivalent```

References:

2. 3.

[TylerLeonhardt]

@meganrogge starting with you on this one... but it does seem welcome views may be owned by @sandy081