ADFA-2686: Add feedback FAB to about landscape/sw600dp variants

The land and sw600dp variants of activity_about.xml omitted the feedback
FAB, which violates the invariant that every page must always offer feedback.
Add the shared feedback_fab include to both variants (bottom|start, matching
portrait).

Now that fab_feedback is present in every activity_about variant, its
View Binding field is non-null, so AboutActivity uses binding.fabFeedback.root
(dropping the previous nullable ?.root) — consistent with the other screens.

Author: hal-eisen-adfa

app/src/main/java/com/itsaky/androidide/activities/AboutActivity.kt

@@ -78,7 +78,7 @@ class AboutActivity : EdgeToEdgeIDEActivity() {
       supportActionBar!!.setDisplayHomeAsUpEnabled(true)
       supportActionBar!!.setTitle(R.string.about)
       toolbar.setNavigationOnClickListener { onBackPressedDispatcher.onBackPressed() }
-        feedbackButtonManager = FeedbackButtonManager(this@AboutActivity, fabFeedback?.root)
+        feedbackButtonManager = FeedbackButtonManager(this@AboutActivity, fabFeedback.root)
         feedbackButtonManager?.setupDraggableFab()
 
       aboutHeader.apply {

app/src/main/res/layout-land/activity_about.xml

@@ -118,4 +118,12 @@
 
   </com.google.android.material.appbar.AppBarLayout>
 
+  <include
+      android:id="@+id/fab_feedback"
+      layout="@layout/feedback_fab"
+      android:layout_width="wrap_content"
+      android:layout_height="wrap_content"
+      android:layout_margin="16dp"
+      android:layout_gravity="bottom|start" />
+
 </androidx.coordinatorlayout.widget.CoordinatorLayout>

app/src/main/res/layout-sw600dp/activity_about.xml

@@ -118,4 +118,12 @@
 
   </com.google.android.material.appbar.AppBarLayout>
 
+  <include
+      android:id="@+id/fab_feedback"
+      layout="@layout/feedback_fab"
+      android:layout_width="wrap_content"
+      android:layout_height="wrap_content"
+      android:layout_margin="16dp"
+      android:layout_gravity="bottom|start" />
+
 </androidx.coordinatorlayout.widget.CoordinatorLayout>