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_home_tile.xml

@@ -1,21 +1,21 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!-- Full-width row: on a 240 px screen two side by side cut their titles short. -->
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="0dp"
-    android:layout_height="58dp"
-    android:layout_weight="1"
+    android:layout_width="match_parent"
+    android:layout_height="@dimen/tile"
     android:orientation="horizontal"
     android:gravity="center_vertical"
     android:background="@drawable/bg_tile"
-    android:paddingLeft="8dp"
-    android:paddingRight="6dp"
+    android:paddingLeft="12dp"
+    android:paddingRight="10dp"
     android:clickable="true"
     android:focusable="true">
-    <ImageView android:id="@+id/tile_icon" android:layout_width="26dp" android:layout_height="26dp" />
+    <ImageView android:id="@+id/tile_icon" android:layout_width="@dimen/tile_icon" android:layout_height="@dimen/tile_icon" />
     <LinearLayout android:layout_width="0dp" android:layout_height="wrap_content"
-        android:layout_weight="1" android:orientation="vertical" android:paddingLeft="7dp">
+        android:layout_weight="1" android:orientation="vertical" android:paddingLeft="12dp">
         <TextView android:id="@+id/tile_title" style="@style/Title"
-            android:layout_width="match_parent" android:layout_height="wrap_content" android:textSize="13sp" />
+            android:layout_width="match_parent" android:layout_height="wrap_content" android:textSize="@dimen/text_tile" />
         <TextView android:id="@+id/tile_sub" style="@style/Sub"
-            android:layout_width="match_parent" android:layout_height="wrap_content" android:textSize="10sp" />
+            android:layout_width="match_parent" android:layout_height="wrap_content" android:textSize="@dimen/text_small" />
     </LinearLayout>
 </LinearLayout>