chore: hotfix versioning 2.0.0.1 and honest telemetry placeholders when the bridge is missing

- Version numbers gain a fourth hotfix component (2.0.0.1); the workflow maps it to the
  Windows file build number.
- The system panel shows dashes instead of 0% until real measurements arrive from the
  main process.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017Wn5VX9HNbJ7N54hR24u9Y

src/components/panels/Telemetry.tsx

@@ -28,11 +28,11 @@ export function Telemetry() {
         <Activity size={14} />
         <span>Système</span>
         <span className="spacer" />
-        <span className="chip">{m.hostname}</span>
+        <span className="chip">{m.live ? m.hostname : 'HORS PONT'}</span>
       </header>
       <div className="telemetry">
-        <Gauge value={m.cpuLoad} max={100} label="CPU" display={`${Math.round(m.cpuLoad)}%`} warn={90} />
-        <Gauge value={m.memUsedPct} max={100} label="RAM" display={`${Math.round(m.memUsedPct)}%`} warn={92} />
+        <Gauge value={m.cpuLoad} max={100} label="CPU" display={m.live ? `${Math.round(m.cpuLoad)}%` : '—'} warn={90} />
+        <Gauge value={m.memUsedPct} max={100} label="RAM" display={m.live ? `${Math.round(m.memUsedPct)}%` : '—'} warn={92} />
         <Gauge value={m.fps} max={60} label="FPS" display={`${m.fps}`} />
         <Gauge value={m.cpuFreqMhz} max={5500} label="GHz" display={m.cpuFreqMhz ? (m.cpuFreqMhz / 1000).toFixed(1) : '—'} />
       </div>

src/hooks/useMetrics.ts

@@ -4,6 +4,8 @@ import { bridge } from '../lib/bridge';
 
 export interface LiveMetrics extends SystemMetrics {
   fps: number;
+  /** false until the main process delivered real measurements */
+  live: boolean;
 }
 
 const EMPTY: LiveMetrics = {
@@ -16,7 +18,8 @@ const EMPTY: LiveMetrics = {
   memUsedPct: 0,
   memTotalGb: 0,
   uptimeSec: 0,
-  fps: 60
+  fps: 60,
+  live: false
 };
 
 export function useMetrics(enabled = true, intervalMs = 2000): LiveMetrics {
@@ -43,7 +46,7 @@ export function useMetrics(enabled = true, intervalMs = 2000): LiveMetrics {
     const api = bridge();
     const poll = () => {
       if (!api) return;
-      api.system.metrics().then((m) => setMetrics((prev) => ({ ...prev, ...m }))).catch(() => undefined);
+      api.system.metrics().then((m) => setMetrics((prev) => ({ ...prev, ...m, live: true }))).catch(() => undefined);
     };
     poll();
     const timer = setInterval(poll, intervalMs);