Add Learn tab; move quit to Safety; remove persistent MOB FAB

UI cleanup:
- Remove always-visible MOB FAB — Safety screen button is sufficient
- Remove floating quit button; move to bottom of Safety screen
- fragment_container is now clickable/focusable, blocking map touch-through
  for all overlays (trip reports, log, safety)
- Record Track FAB hidden while any overlay is shown, visible on map tab

New Learn tab (5th nav item):
- Migration guides for Navionics and Sea People (local markdown via DocFragment)
- ASA Course Catalog, ASA Online Learning, ColRegs, Sailing Flashcards
  (open in browser)
- Remove blanket assets/ .gitignore so markdown docs are tracked

https://claude.ai/code/session_01HXPjBsogsJVRwCiekDGkJX

1 files changed, 11 insertions, 0 deletions

diff --git a/android-app/app/src/main/res/layout/fragment_safety.xml b/android-app/app/src/main/res/layout/fragment_safety.xml
index f90420e..60ea1aa 100644
--- a/android-app/app/src/main/res/layout/fragment_safety.xml
+++ b/android-app/app/src/main/res/layout/fragment_safety.xml
@@ -113,4 +113,15 @@
         android:text="PLAN TRIP (PRE-TRIP REPORT)"
         app:layout_constraintTop_toBottomOf="@id/card_anchor" />
 
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/button_quit"
+        style="@style/Widget.Material3.Button.TextButton"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Quit"
+        android:textColor="?attr/colorOnSurfaceVariant"
+        app:icon="@drawable/ic_close"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>