Tech debt: Room list fast-path, delete AnchorWatchHandler orphan, LogbookRepository thread safety

Room fast-path (item 3):
- TrackEntity.toShallowSavedTrack() reconstructs SavedTrack from cached summary
  data using two placeholder TrackPoints that preserve correct endMs for logbook
  filtering without parsing GPX
- TrackRepository.getSavedTracksFromRoom() returns shallow tracks sorted by startMs
- MainViewModel.init{} now shows Room data immediately (no spinner on warm start),
  then replaces with full GPX-parsed tracks once background load completes

AnchorWatchHandler orphan (item 4):
- Deleted ui/anchorwatch/AnchorWatchHandler.kt — the anchor depth/rode form was
  inlined into SafetyFragment; this Fragment had no navigation entry points left
- Deleted layout/fragment_anchor_watch.xml (only referenced by the deleted Fragment)

LogbookRepository thread safety (item 6):
- Added @Synchronized to save(), getAll(), and reload() to prevent concurrent
  mutation of the entries list and nextId counter across coroutine contexts

https://claude.ai/code/session_01KXYBuAHZkvv63DeUG6XaZD

1 files changed, 0 insertions, 79 deletions

diff --git a/android-app/app/src/main/res/layout/fragment_anchor_watch.xml b/android-app/app/src/main/res/layout/fragment_anchor_watch.xml
deleted file mode 100644
index 96b9969..0000000
--- a/android-app/app/src/main/res/layout/fragment_anchor_watch.xml
+++ /dev/null
@@ -1,79 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<ScrollView
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent">
-
-    <LinearLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:orientation="vertical"
-        android:padding="16dp">
-
-        <TextView
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:text="@string/anchor_watch_title"
-            android:textSize="20sp"
-            android:textStyle="bold"
-            android:layout_marginBottom="24dp" />
-
-        <TextView
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:text="@string/anchor_depth_label"
-            android:textSize="14sp"
-            android:layout_marginBottom="4dp" />
-
-        <EditText
-            android:id="@+id/etDepth"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:hint="@string/anchor_depth_hint"
-            android:inputType="numberDecimal"
-            android:importantForAutofill="no"
-            android:layout_marginBottom="16dp" />
-
-        <TextView
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:text="@string/anchor_rode_label"
-            android:textSize="14sp"
-            android:layout_marginBottom="4dp" />
-
-        <EditText
-            android:id="@+id/etRodeOut"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:hint="@string/anchor_rode_hint"
-            android:inputType="numberDecimal"
-            android:importantForAutofill="no"
-            android:layout_marginBottom="24dp" />
-
-        <TextView
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:text="@string/anchor_suggested_radius_label"
-            android:textSize="14sp"
-            android:layout_marginBottom="4dp" />
-
-        <TextView
-            android:id="@+id/tvSuggestedRadius"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:text="@string/anchor_suggested_radius_empty"
-            android:textSize="18sp"
-            android:textStyle="bold"
-            android:layout_marginBottom="4dp" />
-
-        <TextView
-            android:id="@+id/tvSuggestedRadiusHint"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:text="@string/anchor_suggested_radius_hint"
-            android:textSize="12sp"
-            android:alpha="0.6" />
-
-    </LinearLayout>
-
-</ScrollView>