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, 4 insertions, 0 deletions

diff --git a/android-app/app/src/main/res/menu/bottom_nav_menu.xml b/android-app/app/src/main/res/menu/bottom_nav_menu.xml
index e7fc15d..3037b7e 100644
--- a/android-app/app/src/main/res/menu/bottom_nav_menu.xml
+++ b/android-app/app/src/main/res/menu/bottom_nav_menu.xml
@@ -16,4 +16,8 @@
         android:id="@+id/nav_safety"
         android:icon="@drawable/ic_safety"
         android:title="Safety" />
+    <item
+        android:id="@+id/nav_learn"
+        android:icon="@drawable/ic_learn"
+        android:title="Learn" />
 </menu>