internal/gui: surface warn status + new voice tests in Classic UI

Frontend now renders three-tier status (passed/warn/failed) instead of
two. Warn rows get a yellow exclamation-mark dot, expand by default to
show the hint, and contribute to a new "(with warnings)" suffix on the
"All checks passed" header.

Test catalog gains "voice-quality" and "voice-srv" rows replacing the
single "stun" row, in the same position (after udp, before api). RU
descriptions explain what each test actually probes.

useDrover's lastSummary now reports {total, failed, warnings} so the
Classic header can pick the right tier color.

App.go counts StatusWarn as passed in the final {passed, failed} summary
emitted via "check:done" — warn is a soft pass per spec.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

internal/gui/frontend/src/components/Classic.jsx

@@ -65,7 +65,7 @@ export function ClassicWindow({ mode = 'dark', initial, onToggleMode }) {
   const D = useDrover(initial);
   const [version, setVersion] = React.useState('');
   React.useEffect(() => { GoVersion().then(setVersion).catch(() => {}); }, []);
-  const palette = { pending: t.dimmer, running: t.accent, passed: t.pass, failed: t.danger, skipped: t.skip };
+  const palette = { pending: t.dimmer, running: t.accent, passed: t.pass, failed: t.danger, skipped: t.skip, warn: t.warn };
   const fontMono = '"JetBrains Mono","SF Mono",ui-monospace,Menlo,Consolas,monospace';
   const fontUI   = '"Inter","Segoe UI",system-ui,sans-serif';
   const isActive = D.phase === 'active';
@@ -288,7 +288,9 @@ function ClassicStatus({ t, D, palette, fontMono }) {
               </span>
             </>
           : D.lastSummary?.failed === 0
-            ? <span style={{ color: t.pass, fontWeight: 600 }}>All checks passed. Ready to start.</span>
+            ? (D.lastSummary?.warnings > 0
+                ? <span style={{ color: t.warn, fontWeight: 600 }}>All checks passed (with warnings).</span>
+                : <span style={{ color: t.pass, fontWeight: 600 }}>All checks passed. Ready to start.</span>)
             : <span style={{ color: t.warn, fontWeight: 600 }}>{D.lastSummary?.failed} of {D.tests.length} checks failed. Some features won't work.</span>}
       </div>
       {/* tests */}
@@ -308,23 +310,26 @@ function ClassicStatus({ t, D, palette, fontMono }) {
                   {test.label}
                 </span>
                 <span style={{ marginLeft:'auto', fontFamily: fontMono, fontSize: 11,
-                               color: state === 'failed' ? t.danger : state === 'skipped' ? t.skip : t.dim }}>
+                               color: state === 'failed' ? t.danger : state === 'warn' ? t.warn : state === 'skipped' ? t.skip : t.dim }}>
                   {r?.metric || (state === 'running' ? '...' : '')}
                 </span>
-                {r?.result === 'failed' && (
+                {(r?.result === 'failed' || r?.result === 'warn') && (
                   <button onClick={() => D.toggleExpand(test.id)} style={iconBtnStyle(t)} title="Подробнее">
                     <IconChevron color={t.dim} dir={r.expanded ? 'up' : 'down'}/>
                   </button>
                 )}
               </div>
-              {r?.result === 'failed' && r.expanded && (
+              {(r?.result === 'failed' || r?.result === 'warn') && r.expanded && (
                 <div className="drv-fadein" style={{
                   margin: '4px 0 6px 21px', padding: '8px 10px', borderRadius: 3,
-                  background: mode_mix(t.danger, t.panel, 0.9), border: `1px solid ${mode_mix(t.danger, t.panel, 0.78)}`,
+                  background: mode_mix(r.result === 'warn' ? t.warn : t.danger, t.panel, 0.9),
+                  border: `1px solid ${mode_mix(r.result === 'warn' ? t.warn : t.danger, t.panel, 0.78)}`,
                   fontSize: 11.5, color: t.text,
                 }}>
-                  <div style={{ color: t.danger, fontWeight: 600, marginBottom: 2 }}>{r.error}</div>
-                  <div style={{ color: t.dim }}>{r.hint}</div>
+                  {r.error
+                    ? <div style={{ color: r.result === 'warn' ? t.warn : t.danger, fontWeight: 600, marginBottom: 2 }}>{r.error}</div>
+                    : (r.hint && <div style={{ color: r.result === 'warn' ? t.warn : t.danger, fontWeight: 600, marginBottom: 2 }}>{r.hint}</div>)}
+                  {r.error && <div style={{ color: t.dim }}>{r.hint}</div>}
                   {r.rawHex && (
                     <div style={{
                       fontFamily: fontMono, fontSize: 10.5, color: t.dimmer,