Fix ScaleManager not resizing to parent container (#7213)

[VijayVPatil13]

This PR fixes issue #7213 where the ScaleManager fails to resize the game canvas
to match the size of its parent container.

Root Cause:
The window resize handler only updated canvas bounds, but did not re-measure the
parent container size. As a result, the Scale Manager used outdated parent size
values, causing the canvas to display incorrectly after window resize or mobile
orientation changes.

Fix:

• Added getParentBounds() and refresh() inside listeners.windowResize.
• Ensures the parent container size is always recalculated.
• Forces Phaser to re-run scale calculations using correct parent bounds.

Tested:

• Browser window resize (Chrome, Edge)
• CSS-driven container resizing
• Mobile device orientation change
• RESIZE and FIT scale modes

Result:
The canvas now consistently fills the parent container without clipping,
shifting, or leaving empty space.

This resolves #7213.

---

Note

On window resize, recalculate parent bounds and refresh scaling so the canvas correctly resizes to its parent.

• ScaleManager (src/scale/ScaleManager.js):
  • Window resize listener now recalculates parent bounds and forces a scale refresh:
    • Calls getParentBounds() and refresh() inside listeners.windowResize after updateBounds() to ensure canvas resizes to current parent size.

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[VijayVPatil13]

Thank you for reviewing the PR. Please let me know if any changes are needed.