feat: smaller keymap label, lavender palette, redrawn entry field

The keyboard-layout band is drawn here now, one layout at the offset
Plymouth's table gives it, in half the height — the label at the
password prompt was too large. keyboard.png is scaled to match.

entry.png was pixelated and is redrawn at the same size with smooth
edges. Both frame series, 81 animation and 51 progress, move from the
original blue to Catppuccin's lavender, and the descriptor's background
and progress bar colours follow the rest of the system.

README.md

@@ -10,12 +10,17 @@ prompt Plymouth draws itself when the disk is unlocked.
     images/              animation frames and the prompt's own images
     Screenshot.png       how it looks, from the original upload
 
-`images/keymap-render.png` is deliberately absent. Plymouth cuts the current
-keyboard layout's name out of that band at offsets its own library knows, so
-the file has to match the Plymouth in use — the one the original upload
-carried was from an older version with fewer layouts, and the prompt showed a
-different name, cut off. Packaging takes the file from the installed Plymouth
-instead.
+`images/keymap-render.png` is drawn here rather than taken from upstream.
+Plymouth cuts the current layout's name out of that band at offsets its own
+library knows (`src/libply-splash-graphics/ply-keymap-metadata.h`), so the
+file has to match the Plymouth in use — the one the original upload carried
+was from an older version with fewer layouts, and the prompt showed a
+different name, cut off.
+
+The band here covers one layout, `de`, at the offset that table gives it
+(2253, 51 wide), in half the height upstream uses. `images/keyboard.png` is
+scaled to match. Two consequences: another keyboard layout shows nothing, and
+if Plymouth ever moves that offset, the band has to be redrawn.
 
 `ImageDir` in the descriptor names an FHS path. Packaging rewrites it to
 wherever the theme actually lands — see `pkgs/moonarch-plymouth.nix` in the