Add auto-resend option for not-heard-repeated messages. Closes #154.

frontend/src/components/settings/SettingsRadioSection.tsx

@@ -702,6 +702,26 @@ export function SettingsRadioSection({
             </p>
           </div>
         </div>
+
+        <div className="flex items-start gap-3 rounded-md border border-border/60 p-3">
+          <Checkbox
+            id="auto-resend-channel"
+            checked={appSettings.auto_resend_channel}
+            onCheckedChange={(checked) =>
+              onSaveAppSettings({ auto_resend_channel: checked === true })
+            }
+            className="mt-0.5"
+          />
+          <div className="space-y-1">
+            <Label htmlFor="auto-resend-channel">Auto-Resend Unheard Channel Messages</Label>
+            <p className="text-xs text-muted-foreground">
+              When enabled, outgoing channel messages that receive no echo within 2 seconds are
+              automatically resent once (byte-perfect, within the 30-second dedup window). Repeaters
+              that already heard the original will ignore the duplicate. This functionality will NOT
+              create double-sent/duplicate messages.
+            </p>
+          </div>
+        </div>
       </div>
 
       <div className="space-y-2">

frontend/src/test/settingsModal.test.tsx

@@ -70,6 +70,7 @@ const baseSettings: AppSettings = {
   blocked_names: [],
   discovery_blocked_types: [],
   tracked_telemetry_repeaters: [],
+  auto_resend_channel: false,
 };
 
 function renderModal(overrides?: {

frontend/src/types.ts

@@ -337,12 +337,14 @@ export interface AppSettings {
   blocked_names: string[];
   discovery_blocked_types: number[];
   tracked_telemetry_repeaters: string[];
+  auto_resend_channel: boolean;
 }
 
 export interface AppSettingsUpdate {
   max_radio_contacts?: number;
   auto_decrypt_dm_on_advert?: boolean;
   advert_interval?: number;
+  auto_resend_channel?: boolean;
   flood_scope?: string;
   blocked_keys?: string[];
   blocked_names?: string[];