Minamp 1.6: adjustable UI size, larger text and controls

- New setting "Text and button size" (Normal / Large / Extra large): scales
  text, icons and buttons on top of the phone's density (App.UI_SCALES)
- Larger default text, rows, tiles, touch targets and player icons; all sizes
  now live in res/values/dimens.xml
- Seek bar knob drawn in code, since Android 2.x caches XML shapes at the
  size they were first loaded
- Full-width buttons wrap to two lines instead of cutting words off
- Shorter labels so they fit 240x320 screens in both languages
- tools/check_fit.py checks that UI texts fit their slots at every size and
  language using Droid Sans metrics; build.sh runs it and setup_toolchain.sh
  fetches the font

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

res/layout/view_album_card.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="96dp"
+    android:layout_width="@dimen/card"
     android:layout_height="wrap_content"
     android:orientation="vertical"
     android:padding="4dp"
@@ -8,12 +8,12 @@
     android:clickable="true"
     android:focusable="true">
     <ImageView android:id="@+id/card_art"
-        android:layout_width="88dp" android:layout_height="88dp"
+        android:layout_width="@dimen/card_art" android:layout_height="@dimen/card_art"
         android:scaleType="centerCrop" />
     <TextView android:id="@+id/card_title" style="@style/Title"
         android:layout_width="match_parent" android:layout_height="wrap_content"
-        android:textSize="12sp" android:textStyle="normal" android:paddingTop="4dp" />
+        android:textSize="@dimen/text_card_title" android:textStyle="normal" android:paddingTop="4dp" />
     <TextView android:id="@+id/card_sub" style="@style/Sub"
         android:layout_width="match_parent" android:layout_height="wrap_content"
-        android:textSize="10sp" />
+        android:textSize="@dimen/text_tiny" />
 </LinearLayout>