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/activity_setup.xml

@@ -22,7 +22,7 @@
                 android:text="@string/app_name" android:textSize="26sp" android:textStyle="bold"
                 android:paddingTop="8dp" />
             <TextView android:layout_width="wrap_content" android:layout_height="wrap_content"
-                android:gravity="center" android:textColor="@color/text2" android:textSize="13sp"
+                android:gravity="center" android:textColor="@color/text2" android:textSize="@dimen/text_sub"
                 android:paddingTop="4dp" android:paddingBottom="22dp"
                 android:text="@string/tagline" />
             <Button android:id="@+id/btn_signin" style="@style/ButtonAccent"
@@ -34,7 +34,7 @@
                 android:layout_width="wrap_content" android:layout_height="wrap_content"
                 android:layout_marginTop="18dp" android:padding="8dp"
                 android:background="@drawable/bg_pressable"
-                android:textColor="@color/text2" android:textSize="12sp"
+                android:textColor="@color/text2" android:textSize="@dimen/text_sub"
                 android:text="@string/connection_log" />
         </LinearLayout>
 
@@ -44,14 +44,14 @@
             android:orientation="vertical" android:gravity="center_horizontal"
             android:visibility="gone">
             <TextView android:layout_width="wrap_content" android:layout_height="wrap_content"
-                android:gravity="center" android:textColor="@color/text2" android:textSize="13sp"
+                android:gravity="center" android:textColor="@color/text2" android:textSize="@dimen/text_sub"
                 android:paddingTop="12dp"
                 android:text="@string/pin_open" />
             <TextView android:layout_width="wrap_content" android:layout_height="wrap_content"
                 android:text="plex.tv/link" android:textSize="22sp" android:textStyle="bold"
                 android:textColor="@color/accent" android:paddingTop="4dp" />
             <TextView android:layout_width="wrap_content" android:layout_height="wrap_content"
-                android:textColor="@color/text2" android:textSize="13sp" android:paddingTop="10dp"
+                android:textColor="@color/text2" android:textSize="@dimen/text_sub" android:paddingTop="10dp"
                 android:text="@string/pin_enter" />
             <TextView android:id="@+id/pin_code"
                 android:layout_width="wrap_content" android:layout_height="wrap_content"
@@ -63,7 +63,7 @@
                     android:layout_width="wrap_content" android:layout_height="wrap_content" />
                 <TextView android:id="@+id/pin_status"
                     android:layout_width="wrap_content" android:layout_height="wrap_content"
-                    android:textColor="@color/text2" android:textSize="12sp" android:paddingLeft="8dp"
+                    android:textColor="@color/text2" android:textSize="@dimen/text_sub" android:paddingLeft="8dp"
                     android:text="@string/pin_waiting" />
             </LinearLayout>
             <Button android:id="@+id/btn_pin_check" style="@style/ButtonAccent"
@@ -79,7 +79,7 @@
             android:layout_width="match_parent" android:layout_height="wrap_content"
             android:orientation="vertical" android:visibility="gone">
             <TextView android:layout_width="wrap_content" android:layout_height="wrap_content"
-                android:text="@string/server_address" android:textSize="18sp" android:textStyle="bold" />
+                android:text="@string/server_address" android:textSize="@dimen/text_title" android:textStyle="bold" />
             <TextView style="@style/Sub" android:layout_width="match_parent" android:layout_height="wrap_content"
                 android:singleLine="false" android:paddingTop="4dp" android:paddingBottom="10dp"
                 android:text="@string/server_address_help" />
@@ -102,7 +102,7 @@
             android:orientation="vertical" android:visibility="gone">
             <TextView android:id="@+id/choose_title"
                 android:layout_width="wrap_content" android:layout_height="wrap_content"
-                android:textSize="18sp" android:textStyle="bold" />
+                android:textSize="@dimen/text_title" android:textStyle="bold" />
             <TextView android:id="@+id/choose_sub" style="@style/Sub"
                 android:layout_width="match_parent" android:layout_height="wrap_content"
                 android:singleLine="false" android:paddingTop="2dp" android:paddingBottom="10dp" />
@@ -122,7 +122,7 @@
             <ProgressBar android:layout_width="wrap_content" android:layout_height="wrap_content" />
             <TextView android:id="@+id/busy_text"
                 android:layout_width="wrap_content" android:layout_height="wrap_content"
-                android:gravity="center" android:textColor="@color/text2" android:textSize="13sp"
+                android:gravity="center" android:textColor="@color/text2" android:textSize="@dimen/text_sub"
                 android:paddingTop="12dp" />
         </LinearLayout>
     </LinearLayout>