Title
FAQ WebView: add configurable status-bar visibility, decouple toolbar behavior, and fix form action formatting

Summary
This PR improves FAQ/Helpcenter rendering behavior in KmWebViewActivity and adds a new customization setting to control FAQ status-bar visibility without breaking existing integrations.

Problem

• FAQ fullscreen behavior needed a dedicated control for status bar visibility.
• Toolbar visibility was unintentionally coupled with status-bar visibility.
• webViewClientPost() built form HTML with String.format(FORMID_ACTION) but did not pass required %s arguments.

What changed

1. New FAQ setting

• Added showStatusBarOnFaqPage in CustomizationSettings.
• Added getter: isShowStatusBarOnFaqPage().

2. Backward-compatible default

• Default is set to true to preserve existing behavior for clients that don’t provide this key in JSON.

3. FAQ status-bar handling in KmWebViewActivity

• Detect FAQ/helpcenter flow via KM_HELPCENTER_URL.
• Apply status-bar visibility using WindowInsetsControllerCompat + fullscreen window flag handling.
• Re-apply hide state in lifecycle callbacks (onWindowFocusChanged, onResume) for device consistency.

4. Decoupled toolbar behavior

• FAQ toolbar visibility now depends only on showBackButtonOnFaqPage.
• Status-bar visibility now depends only on showStatusBarOnFaqPage.

5. Form markup bug fix

• Fixed:
  • from: String.format(FORMID_ACTION)
  • to: String.format(FORMID_ACTION, url, "post")
• This prevents malformed format usage and ensures valid HTML form action/method generation.

6. Related rich message image robustness

• In ListKmRichMessage, header image loading now falls back from headerImgSrc to headerImageUrl and still appends SAS token.

Behavior matrix

• showBackButtonOnFaqPage=true, showStatusBarOnFaqPage=true
  • Toolbar visible, status bar visible (existing-like behavior).
• showBackButtonOnFaqPage=false, showStatusBarOnFaqPage=true
  • Toolbar hidden, status bar visible.
• showBackButtonOnFaqPage=true, showStatusBarOnFaqPage=false
  • Toolbar visible, status bar hidden.
• showBackButtonOnFaqPage=false, showStatusBarOnFaqPage=false
  • Toolbar hidden, status bar hidden.

Compatibility

• Non-breaking: new setting defaults to true.
• Existing customers with no new JSON key keep prior status-bar behavior.

Files changed

• kommunicateui/src/main/java/io/kommunicate/ui/CustomizationSettings.java
• kommunicateui/src/main/java/io/kommunicate/ui/conversation/richmessaging/webview/KmWebViewActivity.java
• kommunicateui/src/main/java/io/kommunicate/ui/conversation/richmessaging/types/ListKmRichMessage.java

Validation

• Compiled successfully:
  • ./gradlew :kommunicateui:compileDebugJavaWithJavac

Config usage (optional for consumers)

{
  "showBackButtonOnFaqPage": false,
  "showStatusBarOnFaqPage": false
}