Msg Retry fixes, channel message fixes. Notification fixes. Make more desktop friendly. Enhance retry algo. Fix predicted location clustering add retries to reactions and fix the reactions in private DMS centralize and cleanup code in var areas

lib/helpers/link_handler.dart

@@ -1,8 +1,47 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_linkify/flutter_linkify.dart';
 import 'package:url_launcher/url_launcher.dart';
 import '../l10n/l10n.dart';
+import '../utils/platform_info.dart';
 
 class LinkHandler {
+  /// Returns a [SelectableLinkify] on desktop or a [Linkify] on mobile.
+  static Widget buildLinkifyText({
+    required BuildContext context,
+    required String text,
+    required TextStyle style,
+    TextStyle? linkStyle,
+  }) {
+    final effectiveLinkStyle =
+        linkStyle ??
+        style.copyWith(
+          color: Colors.green,
+          decoration: TextDecoration.underline,
+        );
+    const options = LinkifyOptions(humanize: false, defaultToHttps: false);
+    const linkifiers = [UrlLinkifier()];
+    void onOpen(LinkableElement link) => handleLinkTap(context, link.url);
+
+    if (PlatformInfo.isDesktop) {
+      return SelectableLinkify(
+        text: text,
+        style: style,
+        linkStyle: effectiveLinkStyle,
+        options: options,
+        linkifiers: linkifiers,
+        onOpen: onOpen,
+      );
+    }
+    return Linkify(
+      text: text,
+      style: style,
+      linkStyle: effectiveLinkStyle,
+      options: options,
+      linkifiers: linkifiers,
+      onOpen: onOpen,
+    );
+  }
+
   static Future<void> handleLinkTap(BuildContext context, String url) async {
     // Show confirmation dialog
     final shouldOpen = await showDialog<bool>(

lib/helpers/path_helper.dart

@@ -0,0 +1,31 @@
+import '../models/contact.dart';
+import '../connector/meshcore_protocol.dart';
+
+class PathHelper {
+  static String formatPathHex(List<int> pathBytes) {
+    return pathBytes
+        .map((b) => b.toRadixString(16).padLeft(2, '0').toUpperCase())
+        .join(',');
+  }
+
+  static String resolvePathNames(
+    List<int> pathBytes,
+    List<Contact> allContacts,
+  ) {
+    return pathBytes
+        .map((b) {
+          final hex = b.toRadixString(16).padLeft(2, '0').toUpperCase();
+          final matches = allContacts
+              .where(
+                (c) =>
+                    c.publicKey.first == b &&
+                    (c.type == advTypeRepeater || c.type == advTypeRoom),
+              )
+              .toList();
+          if (matches.isEmpty) return hex;
+          if (matches.length == 1) return matches.first.name;
+          return matches.map((c) => c.name).join(' | ');
+        })
+        .join(' \u2192 ');
+  }
+}

lib/helpers/reaction_helper.dart

@@ -8,6 +8,50 @@ class ReactionInfo {
 }
 
 class ReactionHelper {
+  /// Apply a reaction to a list of messages by matching the reaction hash.
+  ///
+  /// [messages] - the message list to search
+  /// [reactionInfo] - the parsed reaction
+  /// [getTimestampSecs] - extract timestamp seconds from a message
+  /// [getSenderName] - extract sender name for hash (null for 1:1 implicit)
+  /// [getMessageText] - extract message text
+  /// [getReactions] - extract current reactions map
+  /// [shouldSkip] - filter function to skip messages (e.g., skip outgoing for incoming reactions)
+  /// [updateMessage] - callback to update the message at index with new reactions
+  ///
+  /// Returns whether a match was found.
+  static bool applyReaction<T>({
+    required List<T> messages,
+    required ReactionInfo reactionInfo,
+    required int Function(T) getTimestampSecs,
+    required String? Function(T) getSenderName,
+    required String Function(T) getMessageText,
+    required Map<String, int> Function(T) getReactions,
+    required bool Function(T) shouldSkip,
+    required void Function(int index, Map<String, int> newReactions)
+    updateMessage,
+  }) {
+    final targetHash = reactionInfo.targetHash;
+    for (int i = messages.length - 1; i >= 0; i--) {
+      final msg = messages[i];
+      if (shouldSkip(msg)) continue;
+
+      final msgHash = computeReactionHash(
+        getTimestampSecs(msg),
+        getSenderName(msg),
+        getMessageText(msg),
+      );
+      if (msgHash == targetHash) {
+        final currentReactions = Map<String, int>.from(getReactions(msg));
+        currentReactions[reactionInfo.emoji] =
+            (currentReactions[reactionInfo.emoji] ?? 0) + 1;
+        updateMessage(i, currentReactions);
+        return true;
+      }
+    }
+    return false;
+  }
+
   static List<String>? _cachedEmojis;
 
   /// Combined list of all reaction emojis in fixed order.