UI: diversify peer colors; smarter geo notifications; 21m live location (#531)

- Use minimal-distance hue palette for mesh and geohash lists; align chat sender colors with list palette.
- Add foreground geo notifications for different channels; deep-link to bitchat://geohash/<gh>; per-geohash 60s cooldown; respect self/blocks.
- Global geohash sampling runs outside the sheet; delegate handles deeplinks and suppresses when already in-channel.
- Switch location channel sheet to continuous CoreLocation with 21m distance filter; add config knob.
- Only link geohash hashtags when standalone (no @name#abcd or word#abcd).
- Include mesh-reachable peers in mesh counts and in "bitchatters nearby" notification.
- Add TransportConfig knobs for palette and geo notifications.

Co-authored-by: jack <jackjackbits@users.noreply.github.com>

bitchat/Services/LocationChannelManager.swift

@@ -92,23 +92,30 @@ final class LocationChannelManager: NSObject, CLLocationManagerDelegate, Observa
         }
     }
 
-    /// Begin periodic one-shot location refreshes while a selector UI is visible.
+    /// Begin continuous, distance-filtered updates while the channel sheet is visible.
+    /// Uses a 21m filter (configurable) to only refresh on meaningful movement.
     func beginLiveRefresh(interval: TimeInterval = TransportConfig.locationLiveRefreshInterval) {
         guard permissionState == .authorized else { return }
-        // Switch to a lightweight periodic one-shot request (polling) while the sheet is open
+        // Stop any previous polling timer
         refreshTimer?.invalidate()
-        refreshTimer = Timer.scheduledTimer(withTimeInterval: interval, repeats: true) { [weak self] _ in
-            self?.requestOneShotLocation()
-        }
-        // Kick off immediately
+        refreshTimer = nil
+        // Tighten accuracy and distance filter for live view
+        cl.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
+        cl.distanceFilter = TransportConfig.locationDistanceFilterLiveMeters
+        // Start continuous updates
+        cl.startUpdatingLocation()
+        // Request an immediate fix to populate UI without waiting for movement
         requestOneShotLocation()
     }
 
-    /// Stop periodic refreshes when selector UI is dismissed.
+    /// Stop continuous refreshes when selector UI is dismissed.
     func endLiveRefresh() {
         refreshTimer?.invalidate()
         refreshTimer = nil
         cl.stopUpdatingLocation()
+        // Restore more relaxed defaults for background/idle state
+        cl.desiredAccuracy = kCLLocationAccuracyHundredMeters
+        cl.distanceFilter = TransportConfig.locationDistanceFilterMeters
     }
 
     func select(_ channel: ChannelID) {

bitchat/Services/NotificationService.swift

@@ -90,6 +90,15 @@ class NotificationService {
         }
     }
     
+    // Geohash public chat notification with deep link to a specific geohash
+    func sendGeohashActivityNotification(geohash: String, titlePrefix: String = "#", bodyPreview: String) {
+        let title = "\(titlePrefix)\(geohash)"
+        let identifier = "geo-activity-\(geohash)-\(Date().timeIntervalSince1970)"
+        let deeplink = "bitchat://geohash/\(geohash)"
+        let userInfo: [String: Any] = ["deeplink": deeplink]
+        sendLocalNotification(title: title, body: bodyPreview, identifier: identifier, userInfo: userInfo)
+    }
+
     func sendNetworkAvailableNotification(peerCount: Int) {
         let title = "👥 bitchatters nearby!"
         let body = peerCount == 1 ? "1 person around" : "\(peerCount) people around"

bitchat/Services/TransportConfig.swift

@@ -100,8 +100,14 @@ enum TransportConfig {
 
     // Location
     static let locationDistanceFilterMeters: Double = 1000
+    // Live (channel sheet open) distance threshold for meaningful updates
+    static let locationDistanceFilterLiveMeters: Double = 21.0
     static let locationLiveRefreshInterval: TimeInterval = 5.0
 
+    // Notifications (geohash)
+    static let uiGeoNotifyCooldownSeconds: TimeInterval = 60.0
+    static let uiGeoNotifySnippetMaxLen: Int = 80
+
     // Nostr geohash
     static let nostrGeohashInitialLookbackSeconds: TimeInterval = 3600
     static let nostrGeohashInitialLimit: Int = 200
@@ -169,6 +175,10 @@ enum TransportConfig {
     // UI color tuning
     static let uiColorHueAvoidanceDelta: Double = 0.05
     static let uiColorHueOffset: Double = 0.12
+    // Peer list palette
+    static let uiPeerPaletteSlots: Int = 36
+    static let uiPeerPaletteRingBrightnessDeltaLight: Double = 0.07
+    static let uiPeerPaletteRingBrightnessDeltaDark: Double = -0.07
 
     // UI windowing (infinite scroll)
     static let uiWindowInitialCountPublic: Int = 300