fix(android-edge-to-edge-support): opt into edge-to-edge on all API levels

[robingenz]

Summary

Calls WindowCompat.setDecorFitsSystemWindows(window, false) in EdgeToEdge.enable(). This is the one-line alternative to #839 (Option B: hybrid overlay + Window.setStatusBarColor fallback).

This opens a comparison PR against #839 — pick one.

Why

On API <35 with the default decorFitsSystemWindows = true, the DecorView auto-consumes system bar insets as padding before they reach the plugin's WebView listener. The overlay positions silently depended on another plugin (@capacitor/keyboard ≤ 8.0.1) keeping a no-op setOnApplyWindowInsetsListener on the root view, which happened to disable the auto-consumption.

@capacitor/keyboard 8.0.2+ changed that listener's behavior and 8.0.3 moved it to a different view, breaking the implicit contract:

• 8.0.2: overlay rendered ABOVE the nav bar (root view padded by the keyboard plugin's ViewCompat.onApplyWindowInsets call).
• 8.0.3: overlay has height 0 (DecorView resumes auto-consuming insets).

Calling setDecorFitsSystemWindows(false) is the official platform opt-in for edge-to-edge layout and tells the window we handle all insets ourselves. On Android 15+ the platform already does this; on older APIs this is a no-op to app code that was already correctly sized via the plugin's explicit margin logic.

Trade-offs vs #839

• Smaller diff (1 line + comment) vs fix(android-edge-to-edge-support): use Window color API when edge-to-edge is not enforced #839 (hybrid branching, nullable config, ~150 lines).
• Unified code path across API levels vs two separate paths.
• Behavior change on API <35: the plugin now explicitly enables edge-to-edge instead of preserving the traditional app layout. README claim "this plugin doesn't enable edge-to-edge mode by default" becomes incorrect and would need updating.
• Status/nav bars go transparent by default on API <35 when the user hasn't configured a color. fix(android-edge-to-edge-support): use Window color API when edge-to-edge is not enforced #839 preserves the theme default in that case.

Test plan

• API 31 emulator, @capacitor/keyboard@8.0.3 — setNavigationBarColor and setStatusBarColor work.
• API 31 emulator, @capacitor/keyboard@8.0.1 — no regression.
• API 31 with no color configured — confirm theme bars look acceptable (or are visibly transparent — pick the expected behavior).
• API 35 without opt-out — overlay approach still works.
• API 35 with windowOptOutEdgeToEdgeEnforcement=true — still works after explicit opt-in.
• API 36 — overlay approach used.
• Keyboard show/hide on each — webview layout correct, no double-counted bottom inset.

Close #838

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commit: b1c56b7