Merge branch 'main' into pr-339

# Conflicts:
#	frontend/AGENTS.md

frontend/src/components/settings/SettingsStatisticsSection.tsx

@@ -13,12 +13,76 @@ import {
 } from 'recharts';
 import { Separator } from '../ui/separator';
 import { api } from '../../api';
-import type { StatisticsResponse } from '../../types';
+import type { RegionScopeStats, StatisticsResponse } from '../../types';
 
 function formatPercent(value: number): string {
   return `${value.toFixed(1)}%`;
 }
 
+/**
+ * Regional flood-scope adoption. Deliberately shows fractions rather than bare
+ * percentages: with adoption this sparse, "3 of 117" communicates the sample
+ * size that "2.6%" hides.
+ */
+function RegionScopeStatsPanel({ stats }: { stats: RegionScopeStats }) {
+  // Corrupt RF captures land in the packet table with random headers, some of
+  // which claim to be region-scoped. At or below the measured floor there is
+  // nothing to report but noise, so withhold the percentage and say so.
+  const floor = stats.false_positive_floor;
+  const withinNoise = stats.scoped_messages <= floor;
+  // Real-world scoping is currently rare enough that the share rounds to "0.0%",
+  // which reads as a broken widget. Below that resolution the fraction alone is
+  // the honest presentation.
+  const showTrafficPct = stats.total_messages > 0 && !withinNoise && stats.scoped_pct >= 0.05;
+
+  return (
+    <div>
+      <h3 className="text-base font-semibold tracking-tight mb-2">Region Scope (24h)</h3>
+      <p className="text-[0.8125rem] text-muted-foreground mb-3">
+        How much local traffic uses regional flood scoping. Traffic covers all channel messages
+        heard, including channels you have no key for; senders only counts channels you can decrypt,
+        so the two use different denominators and will not match.
+      </p>
+      <div className="space-y-2">
+        <div className="flex justify-between items-center gap-4">
+          <span className="text-sm text-muted-foreground">Scoped messages</span>
+          <span className="font-medium text-right">
+            {stats.scoped_messages.toLocaleString()} of {stats.total_messages.toLocaleString()}
+            {showTrafficPct && (
+              <span className="text-muted-foreground"> ({formatPercent(stats.scoped_pct)})</span>
+            )}
+          </span>
+        </div>
+        <div className="flex justify-between items-center gap-4">
+          <span className="text-sm text-muted-foreground">Senders using regions</span>
+          <span className="font-medium text-right">
+            {stats.scoped_senders.toLocaleString()} of {stats.total_senders.toLocaleString()}
+            {stats.total_senders > 0 && (
+              <span className="text-muted-foreground">
+                {' '}
+                ({formatPercent(stats.scoped_senders_pct)})
+              </span>
+            )}
+          </span>
+        </div>
+      </div>
+      {floor > 0 && stats.scoped_messages > 0 && (
+        <p className="text-[0.8125rem] text-muted-foreground mt-2">
+          {withinNoise
+            ? `Scoped message count is at or below the estimated false-positive floor (${floor.toFixed(0)}) from corrupt packet captures, so it is not evidence of regional adoption.`
+            : `Includes an estimated ${floor.toFixed(0)} false positives from corrupt packet captures.`}{' '}
+          The sender count is unaffected — it requires successful decryption.
+        </p>
+      )}
+      {stats.total_messages === 0 && (
+        <p className="text-sm text-muted-foreground mt-2">
+          No channel messages heard in the last 24 hours.
+        </p>
+      )}
+    </div>
+  );
+}
+
 const CHANNEL_BAR_COLORS = ['#0ea5e9', '#10b981', '#f59e0b', '#f43f5e', '#8b5cf6'];
 
 const TOOLTIP_STYLE = {
@@ -404,6 +468,11 @@ export function SettingsStatisticsSection({ className }: { className?: string })
             )}
           </div>
 
+          <Separator />
+
+          {/* Region Scope */}
+          <RegionScopeStatsPanel stats={stats.region_scope_24h} />
+
           {/* Busiest Channels */}
           {stats.busiest_channels_24h.length > 0 && (
             <>

frontend/src/test/settingsModal.test.tsx

@@ -777,6 +777,15 @@ describe('SettingsModal', () => {
         double_byte_pct: 30,
         triple_byte_pct: 20,
       },
+      region_scope_24h: {
+        total_messages: 120,
+        scoped_messages: 40,
+        scoped_pct: 33.3,
+        false_positive_floor: 2,
+        total_senders: 12,
+        scoped_senders: 3,
+        scoped_senders_pct: 25,
+      },
       packets_per_hour_72h: [
         { timestamp: 1711792800, count: 12 },
         { timestamp: 1711796400, count: 8 },
@@ -824,6 +833,146 @@ describe('SettingsModal', () => {
     expect(screen.getByText('Known-channels active')).toBeInTheDocument();
     expect(screen.getByText('Busiest Channels (24h)')).toBeInTheDocument();
     expect(screen.getByText('Noise Floor (24h)')).toBeInTheDocument();
+    expect(screen.getByText('Region Scope (24h)')).toBeInTheDocument();
+    // Fractions, not bare percentages — the sample size matters at this sparsity
+    expect(screen.getByText(/40 of 120/)).toBeInTheDocument();
+    expect(screen.getByText(/3 of 12/)).toBeInTheDocument();
+    // 40 scoped is well above the floor of 2, so the percentage is shown
+    expect(screen.getByText(/33\.3%/)).toBeInTheDocument();
+    expect(
+      screen.queryByText(/at or below the estimated false-positive floor/)
+    ).not.toBeInTheDocument();
+  });
+
+  it('discloses the false-positive floor and withholds a sub-0.1% scoped share', async () => {
+    const mockStats: StatisticsResponse = {
+      busiest_channels_24h: [],
+      contact_count: 0,
+      repeater_count: 0,
+      channel_count: 0,
+      total_packets: 0,
+      decrypted_packets: 0,
+      undecrypted_packets: 0,
+      total_dms: 0,
+      total_channel_messages: 0,
+      total_outgoing: 0,
+      contacts_heard: { last_hour: 0, last_24_hours: 0, last_week: 0 },
+      repeaters_heard: { last_hour: 0, last_24_hours: 0, last_week: 0 },
+      known_channels_active: { last_hour: 0, last_24_hours: 0, last_week: 0 },
+      path_hash_width_24h: {
+        total_packets: 0,
+        single_byte: 0,
+        double_byte: 0,
+        triple_byte: 0,
+        single_byte_pct: 0,
+        double_byte_pct: 0,
+        triple_byte_pct: 0,
+      },
+      // Mirrors real-world data: 70 "scoped" packets against a measured floor of
+      // 60 is corrupt-capture noise, not adoption.
+      region_scope_24h: {
+        total_messages: 391757,
+        scoped_messages: 70,
+        scoped_pct: 0.0179,
+        false_positive_floor: 60.3,
+        total_senders: 117,
+        scoped_senders: 3,
+        scoped_senders_pct: 2.56,
+      },
+      packets_per_hour_72h: [],
+      noise_floor_24h: {
+        sample_interval_seconds: 60,
+        coverage_seconds: 0,
+        latest_noise_floor_dbm: null,
+        latest_timestamp: null,
+        samples: [],
+      },
+    };
+
+    vi.spyOn(globalThis, 'fetch').mockResolvedValue(
+      new Response(JSON.stringify(mockStats), {
+        status: 200,
+        headers: { 'Content-Type': 'application/json' },
+      })
+    );
+
+    renderModal({ externalSidebarNav: true, desktopSection: 'statistics' });
+
+    await waitFor(() => {
+      expect(screen.getByText('Region Scope (24h)')).toBeInTheDocument();
+    });
+
+    // 70 scoped sits just above the 60.3 floor, so most of it is corrupt captures
+    expect(screen.getByText(/Includes an estimated 60 false positives/)).toBeInTheDocument();
+    // 0.0179% would render as a meaningless "0.0%", so the share is withheld
+    expect(screen.queryByText(/0\.0%/)).not.toBeInTheDocument();
+    expect(screen.getByText(/70 of 391,757/)).toBeInTheDocument();
+    // ...but the decryption-backed sender figure still stands
+    expect(screen.getByText(/3 of 117/)).toBeInTheDocument();
+    expect(screen.getByText(/2\.6%/)).toBeInTheDocument();
+  });
+
+  it('reports scoped traffic as noise when it is at or below the floor', async () => {
+    const mockStats: StatisticsResponse = {
+      busiest_channels_24h: [],
+      contact_count: 0,
+      repeater_count: 0,
+      channel_count: 0,
+      total_packets: 0,
+      decrypted_packets: 0,
+      undecrypted_packets: 0,
+      total_dms: 0,
+      total_channel_messages: 0,
+      total_outgoing: 0,
+      contacts_heard: { last_hour: 0, last_24_hours: 0, last_week: 0 },
+      repeaters_heard: { last_hour: 0, last_24_hours: 0, last_week: 0 },
+      known_channels_active: { last_hour: 0, last_24_hours: 0, last_week: 0 },
+      path_hash_width_24h: {
+        total_packets: 0,
+        single_byte: 0,
+        double_byte: 0,
+        triple_byte: 0,
+        single_byte_pct: 0,
+        double_byte_pct: 0,
+        triple_byte_pct: 0,
+      },
+      region_scope_24h: {
+        total_messages: 5000,
+        scoped_messages: 12,
+        scoped_pct: 0.24,
+        false_positive_floor: 20,
+        total_senders: 40,
+        scoped_senders: 0,
+        scoped_senders_pct: 0,
+      },
+      packets_per_hour_72h: [],
+      noise_floor_24h: {
+        sample_interval_seconds: 60,
+        coverage_seconds: 0,
+        latest_noise_floor_dbm: null,
+        latest_timestamp: null,
+        samples: [],
+      },
+    };
+
+    vi.spyOn(globalThis, 'fetch').mockResolvedValue(
+      new Response(JSON.stringify(mockStats), {
+        status: 200,
+        headers: { 'Content-Type': 'application/json' },
+      })
+    );
+
+    renderModal({ externalSidebarNav: true, desktopSection: 'statistics' });
+
+    await waitFor(() => {
+      expect(screen.getByText('Region Scope (24h)')).toBeInTheDocument();
+    });
+
+    expect(
+      screen.getByText(/at or below the estimated false-positive floor \(20\)/)
+    ).toBeInTheDocument();
+    // Percentage withheld even though 0.24% would round visibly — it is noise
+    expect(screen.queryByText(/0\.2%/)).not.toBeInTheDocument();
   });
 
   it('fetches statistics when expanded in mobile external-nav mode', async () => {
@@ -850,6 +999,15 @@ describe('SettingsModal', () => {
         double_byte_pct: 30,
         triple_byte_pct: 20,
       },
+      region_scope_24h: {
+        total_messages: 0,
+        scoped_messages: 0,
+        scoped_pct: 0,
+        false_positive_floor: 0,
+        total_senders: 0,
+        scoped_senders: 0,
+        scoped_senders_pct: 0,
+      },
       packets_per_hour_72h: [],
       noise_floor_24h: {
         sample_interval_seconds: 60,

frontend/src/types.ts

@@ -674,6 +674,24 @@ interface PacketsPerHourBucket {
   count: number;
 }
 
+/**
+ * Regional flood-scope adoption over the last 24h. Two views with different
+ * denominators that will not agree — traffic spans all channels including
+ * undecryptable ones (so it carries a false-positive floor from corrupt RF
+ * captures), while senders requires decryption and is therefore noise-free but
+ * limited to channels we hold keys for.
+ */
+export interface RegionScopeStats {
+  total_messages: number;
+  scoped_messages: number;
+  scoped_pct: number;
+  /** Estimated false positives in scoped_messages. At or below this = not adoption. */
+  false_positive_floor: number;
+  total_senders: number;
+  scoped_senders: number;
+  scoped_senders_pct: number;
+}
+
 export interface StatisticsResponse {
   busiest_channels_24h: BusyChannel[];
   contact_count: number;
@@ -697,6 +715,7 @@ export interface StatisticsResponse {
     double_byte_pct: number;
     triple_byte_pct: number;
   };
+  region_scope_24h: RegionScopeStats;
   packets_per_hour_72h: PacketsPerHourBucket[];
   noise_floor_24h: NoiseFloorHistoryStats;
 }