Close DV-01–04,07,09,13,14: unify operator-deck UX in server/web.

Standardize neon cyan on #00e8f5, wire SacredPageHeader across Builds/Path Tracer/LOTL, dedupe Pages.css, align Path Tracer chrome, drop dead wealth-deck CSS, add prefers-color-scheme shell + HelpTip, sidebar version from package.json build inject, and Vitest CSS regression guards.

agent/miner/fallback_chain_test.go

@@ -301,6 +301,60 @@ func TestTryChainRunTierHooksPopulatesLOTLFields(t *testing.T) {
 	}
 }
 
+func TestOnMethodFailedReporterIncludesFailedMethods(t *testing.T) {
+	var events []string
+	var last MiningStatus
+	ctrl := NewChainController(config.RuntimeConfig{
+		BuiltinConfig: config.BuiltinConfig{MinerExecution: ExecutionAuto},
+	}, ChainHooks{}, func(status MiningStatus, eventType string) {
+		events = append(events, eventType)
+		last = status
+	})
+
+	ctrl.OnMethodFailed(MethodContainer, "docker blocked")
+	if len(last.FailedMethods) != 1 {
+		t.Fatalf("failed_methods=%v", last.FailedMethods)
+	}
+	if last.FailedMethods[0].Method != MethodContainer || last.FailedMethods[0].Reason != "docker blocked" {
+		t.Fatalf("failure=%+v", last.FailedMethods[0])
+	}
+	if last.FailedMethods[0].At == "" {
+		t.Fatal("expected RFC3339 timestamp on failure")
+	}
+	if len(events) != 1 || events[0] != "mining_fallback" {
+		t.Fatalf("events=%v", events)
+	}
+}
+
+func TestRestartChainBypassesCooldown(t *testing.T) {
+	attempts := 0
+	hooks := ChainHooks{
+		StartInProcess: func() error {
+			attempts++
+			return nil
+		},
+	}
+	ctrl := NewChainController(config.RuntimeConfig{
+		BuiltinConfig: config.BuiltinConfig{MinerExecution: ExecutionInProcess},
+	}, hooks, nil)
+	ctrl.chain = []MiningMethod{MethodInProcess}
+
+	if _, err := ctrl.TryChain(context.Background()); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := ctrl.TryChain(context.Background()); err != nil {
+		t.Fatal(err)
+	}
+	if attempts != 1 {
+		t.Fatalf("attempts=%d want 1 before restart", attempts)
+	}
+
+	ctrl.RestartChain(context.Background())
+	if attempts != 2 {
+		t.Fatalf("attempts=%d want 2 after RestartChain clears cooldown", attempts)
+	}
+}
+
 func TestTryChainRespectsCooldown(t *testing.T) {
 	attempts := 0
 	hooks := ChainHooks{