feat: add software back button

app/src/main/java/io/benwiegand/projection/geargrinder/ProjectionActivity.java

@@ -92,6 +92,8 @@ public class ProjectionActivity extends AppCompatActivity implements MakeshiftBi
 
         }
 
+        findViewById(R.id.soft_back_button).setOnClickListener(v -> getOnBackPressedDispatcher().onBackPressed());
+
         // components
         taskManager = new ProjectionTaskManager(findViewById(R.id.content_frame));
         appDock = new AppDock(findViewById(R.id.app_dock), taskManager, this);

app/src/main/res/drawable/soft_back.xml

@@ -0,0 +1,5 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:height="32dp" android:viewportHeight="512" android:viewportWidth="512" android:width="32dp">
+      
+    <path android:fillColor="#ffffff" android:pathData="m120.2,256 l271.6,156.81 -0,-313.62z" android:strokeColor="#ffffff" android:strokeLineCap="round" android:strokeLineJoin="round" android:strokeWidth="32"/>
+    
+</vector>

app/src/main/res/layout/activity_projection.xml

@@ -122,6 +122,14 @@
 
             </LinearLayout>
 
+            <ImageButton
+                android:id="@+id/soft_back_button"
+                android:layout_width="48dp"
+                android:layout_height="48dp"
+                android:src="@drawable/soft_back"
+                android:background="?selectableItemBackgroundBorderless"
+                />
+
         </LinearLayout>
 
     </LinearLayout>

assets/soft_back.svg

@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="512"
+   height="512"
+   viewBox="0 0 512 512"
+   version="1.1"
+   id="svg1"
+   inkscape:version="1.4.3 (0d15f75042, 2025-12-25)"
+   sodipodi:docname="soft_back.svg"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <sodipodi:namedview
+     id="namedview1"
+     pagecolor="#000000"
+     bordercolor="#000000"
+     borderopacity="0.25"
+     inkscape:showpageshadow="2"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     inkscape:document-units="px"
+     inkscape:zoom="1.0143837"
+     inkscape:cx="237.08977"
+     inkscape:cy="259.76363"
+     inkscape:window-width="1918"
+     inkscape:window-height="1062"
+     inkscape:window-x="0"
+     inkscape:window-y="0"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="layer1" />
+  <defs
+     id="defs1" />
+  <g
+     inkscape:label="Layer 1"
+     inkscape:groupmode="layer"
+     id="layer1">
+    <path
+       sodipodi:type="star"
+       style="fill:#ffffff;stroke:#ffffff;stroke-width:32;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:7.1;paint-order:markers fill stroke;fill-opacity:1"
+       id="path1"
+       inkscape:flatsided="true"
+       sodipodi:sides="3"
+       sodipodi:cx="256"
+       sodipodi:cy="256"
+       sodipodi:r1="181.06732"
+       sodipodi:r2="90.533661"
+       sodipodi:arg1="0"
+       sodipodi:arg2="1.0471976"
+       inkscape:rounded="0"
+       inkscape:randomized="0"
+       d="m 437.06732,256 -271.60098,156.8089 0,-313.6178 z"
+       inkscape:transform-center-x="45.266831"
+       transform="matrix(-1,0,0,1,557.26603,0)" />
+  </g>
+</svg>