merge: reconcile master particle-wind work with origin/main redesign

Merged divergent branches (common ancestor a9d87b6). Took origin/main
as base (layer manager, recenter, quit button, GPX tracks, marine
conditions, dark theme, user position layer, active/past track layers)
and layered in particle wind simulation work:

- MapHandler: added setupWindLayer, updateWindLayer, updateWindGridLayer;
  kept their user-pos layer, follow/recenter state, active+past tracks
- WeatherRepository: kept their fetchCurrentConditions, added fetchWindGrid
- MainViewModel: kept their track/marine/summary changes, added windGrid
  StateFlow, loadWindGrid, buildGrid
- MainActivity: kept their full UI (layer picker, quit, recenter, fade
  animations), added particleWindView wiring, weatherLoaded guard,
  windArrow/windGrid observers
- activity_main.xml: took their LinearLayout redesign, added ParticleWindView
  overlay inside ConstraintLayout

https://claude.ai/code/session_01HXPjBsogsJVRwCiekDGkJX

1 files changed, 82 insertions, 0 deletions

diff --git a/scripts/.claude/ct-wire-anchor-to-map.yaml b/scripts/.claude/ct-wire-anchor-to-map.yaml
new file mode 100644
index 0000000..9ef8513
--- /dev/null
+++ b/scripts/.claude/ct-wire-anchor-to-map.yaml
@@ -0,0 +1,82 @@
+name: "Wire anchor watch state to map overlay"
+description: "LocationService.anchorWatchState is collected in MainActivity but only updates SafetyFragment text — MapHandler.updateAnchorWatch() is never called, so the anchor point and radius circle never appear on the map"
+agent:
+  model: "sonnet"
+  working_dir: "/workspace/nav"
+  instructions: |
+    Context
+    -------
+    LocationService.anchorWatchState: StateFlow<AnchorWatchState>
+        (android-app/app/src/main/kotlin/org/terst/nav/LocationService.kt, companion, line ~353)
+
+    MapHandler.updateAnchorWatch(state: AnchorWatchState) is fully implemented — it shows
+    an anchor icon and radius circle on the map, or clears them when inactive:
+        (android-app/app/src/main/kotlin/org/terst/nav/ui/MapHandler.kt, line ~139)
+
+    In MainActivity.observeDataSources(), anchorWatchState IS collected, but only
+    to update a text field in SafetyFragment:
+        LocationService.anchorWatchState.collect { state ->
+            safetyFragment.updateAnchorStatus(...)
+        }
+    There is no call to mapHandler?.updateAnchorWatch(state) anywhere.
+
+    AnchorWatchState:
+        (android-app/app/src/main/kotlin/org/terst/nav/AnchorWatchData.kt)
+        data class AnchorWatchState(
+            val isActive: Boolean,
+            val anchorLocation: Location?,
+            val watchCircleRadiusMeters: Double,
+            val setTimeMillis: Long
+        )
+
+    The map style must be loaded before calling updateAnchorWatch — gate on loadedStyleFlow.
+
+    Goal
+    ----
+    In the existing anchorWatchState collector in observeDataSources(), add a call to
+    mapHandler?.updateAnchorWatch(state) alongside the existing safetyFragment update.
+    Gate the map call on the style being loaded.
+
+    Step 1 — Update the existing collector
+    ---------------------------------------
+    In android-app/app/src/main/kotlin/org/terst/nav/MainActivity.kt,
+    find the anchorWatchState collector in observeDataSources():
+
+        lifecycleScope.launch {
+            LocationService.anchorWatchState.collect { state ->
+                safetyFragment.updateAnchorStatus(if (state.isActive) "Active: ${state.watchCircleRadiusMeters}m" else "Inactive")
+            }
+        }
+
+    Replace with:
+
+        lifecycleScope.launch {
+            LocationService.anchorWatchState.collect { state ->
+                safetyFragment.updateAnchorStatus(if (state.isActive) "Active: ${state.watchCircleRadiusMeters}m" else "Inactive")
+                if (loadedStyleFlow.value != null) {
+                    mapHandler?.updateAnchorWatch(state)
+                }
+            }
+        }
+
+    No import changes needed.
+
+    Step 2 — Build
+    --------------
+    cd android-app && ANDROID_HOME=/opt/android-sdk ./gradlew assembleDebug 2>&1 | tail -5
+    Confirm BUILD SUCCESSFUL.
+
+    Step 3 — Commit and push
+    ------------------------
+    git add android-app/app/src/main/kotlin/org/terst/nav/MainActivity.kt
+    git commit -m "fix(map): wire anchor watch state to map overlay
+
+    The anchorWatchState collector in observeDataSources() was only updating
+    SafetyFragment text. Now also calls mapHandler.updateAnchorWatch(state)
+    when the map style is loaded, showing the anchor icon and radius circle."
+    git push github main && git push local main
+timeout: "15m"
+tags:
+  - "map"
+  - "anchor"
+  - "wiring"