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/app.go

@@ -68,8 +68,8 @@ type Config struct {
 // for them on the "check:result" event. Mirrors checker.Result but with
 // Duration converted to milliseconds (int) for the JS side.
 type CheckResult struct {
-	ID       string `json:"id"`     // tcp / greet / auth / connect / udp / stun / api
-	Status   string `json:"status"` // running | passed | failed | skipped
+	ID       string `json:"id"`     // tcp / greet / auth / connect / udp / voice-quality / voice-srv / api
+	Status   string `json:"status"` // running | passed | warn | failed | skipped
 	Metric   string `json:"metric,omitempty"`
 	Error    string `json:"error,omitempty"`
 	Hint     string `json:"hint,omitempty"`
@@ -136,7 +136,9 @@ func (a *App) RunCheck(cfg Config) {
 				Attempt:  r.Attempt,
 			})
 			switch r.Status {
-			case checker.StatusPassed:
+			case checker.StatusPassed, checker.StatusWarn:
+				// Warn is a "soft pass" — counted as passed for the
+				// final summary, but the row still surfaces the hint.
 				passed++
 			case checker.StatusFailed:
 				failed++