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_miniplayer.xml

@@ -11,21 +11,21 @@
         android:id="@+id/mini_progress"
         style="@android:style/Widget.ProgressBar.Horizontal"
         android:layout_width="match_parent"
-        android:layout_height="2dp"
+        android:layout_height="3dp"
         android:max="1000"
         android:progressDrawable="@drawable/progress_mini" />
 
     <LinearLayout
         android:id="@+id/mini_body"
         android:layout_width="match_parent"
-        android:layout_height="50dp"
+        android:layout_height="@dimen/mini"
         android:orientation="horizontal"
         android:gravity="center_vertical"
         android:background="@drawable/bg_pressable"
         android:paddingLeft="5dp">
 
         <ImageView android:id="@+id/mini_art"
-            android:layout_width="40dp" android:layout_height="40dp"
+            android:layout_width="@dimen/mini_art" android:layout_height="@dimen/mini_art"
             android:scaleType="centerCrop" />
 
         <LinearLayout
@@ -34,10 +34,10 @@
             android:paddingLeft="8dp">
             <TextView android:id="@+id/mini_title" style="@style/Title"
                 android:layout_width="match_parent" android:layout_height="wrap_content"
-                android:textSize="13sp" />
+                android:textSize="@dimen/text_mini_title" />
             <TextView android:id="@+id/mini_sub" style="@style/Sub"
                 android:layout_width="match_parent" android:layout_height="wrap_content"
-                android:textSize="11sp" />
+                android:textSize="@dimen/text_mini_sub" />
         </LinearLayout>
 
         <ImageButton android:id="@+id/mini_play" style="@style/IconButton" />