fix(android): a field should look recessed, a button raised

They carried the same fill and the same pill, so the password field looked like a command. A field now holds 10 per cent white against a button's 18 and a main action's 30 - hollow against raised, which is the only cue left once borders are gone.

The settings panel also reclaimed the top of the screen, above the title: created hidden, FMX moves it to the head of the stack when it becomes visible. Its position is now reasserted each time it appears.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

android-client/theme/pm-dark.style

@@ -2075,7 +2075,7 @@
     object TRectangle
       StyleName = 'background'
       Align = Contents
-      Fill.Color = x2EFFFFFF
+      Fill.Color = x1AFFFFFF
       Locked = True
       Height = 22.000000000000000000
       HitTest = False
@@ -2509,7 +2509,7 @@
     object TRectangle
       StyleName = 'background'
       Align = Contents
-      Fill.Color = x2EFFFFFF
+      Fill.Color = x1AFFFFFF
       Locked = True
       Height = 131.000000000000000000
       HitTest = False