Draw static and rotation wallpapers at the display size

[codenameakshay]

Every static scale mode was drawn onto the launcher's desired size, which is 4800×2400 on a 1080×2400 phone. The whole bitmap went in as the crop hint, and Android shows a screen-sized window from its left edge. The result said applied, but:

• fitCenter and center gave an all-black home screen.
• centerCrop, fill, and stretch showed only a zoomed-in left strip.

The test image is a portrait 1080×2400 with red, green, and blue columns, a white top, and a yellow bottom. Every mode should show all three columns. From left to right: centerCrop, fitCenter, center, fill, stretch.

Before

After

 applyBitmap
-  size = WallpaperManager desired minimum (4800×2400, clamped to 4096×2048)
+  size = display real size in natural orientation (1080×2400), same bounds
   BitmapTransformer.transform(mode, size)
   setBitmap(crop hint = whole bitmap)
 rotation cache
-  center-crop only when larger than the desired size
+  always center-crop to the display size

Trade-off: launchers no longer pan the wallpaper. The Android guide now says so.

Verification

• API 36 emulator: all five modes, screenshots above.
• Three new JVM tests for wallpaperCanvasSize: display size, rotated display, and bounds with aspect ratio kept.
• Local CI: pass.

🤖 Generated with Claude Code