fix(panel): show whole GiB for large switcher memory

- MachineSpecs keeps raw MiB up to 9600, then switches to a rounded whole
  GiB (e.g. 10000 -> "2c 10g")
- cover the boundary and rounding in the group tests

Co-authored-by: CommandCodeBot <noreply@commandcode.ai>

src/internal/mgr/group.go

@@ -2,6 +2,7 @@ package mgr
 
 import (
 	"errors"
+	"math"
 	"regexp"
 	"strconv"
 	"strings"
@@ -21,11 +22,16 @@ func UserGroupLabel(name string) string {
 }
 
 // MachineSpecs renders a compact quota tag for the container switcher:
-// "<cpu>c <mem>m <disk>g", e.g. "2c 2048m 15g". CPU reuses FormatCPU (tenths
-// of a core, so 0.5 stays fractional); memory is the raw MiB value; disk is
+// "<cpu>c <mem> <disk>g", e.g. "2c 2048m 15g". CPU reuses FormatCPU (tenths of
+// a core, so 0.5 stays fractional); memory is the raw MiB value, switching to
+// a rounded whole GiB once it exceeds 9600 MiB (so "2c 10g 15g"); disk is
 // already GiB.
 func MachineSpecs(cpuTenths, memMB, diskGB int) string {
-	return FormatCPU(cpuTenths) + "c " + strconv.Itoa(memMB) + "m " + strconv.Itoa(diskGB) + "g"
+	mem := strconv.Itoa(memMB) + "m"
+	if memMB > 9600 {
+		mem = strconv.Itoa(int(math.Round(float64(memMB)/1024))) + "g"
+	}
+	return FormatCPU(cpuTenths) + "c " + mem + " " + strconv.Itoa(diskGB) + "g"
 }
 
 type UserGroup struct {

src/internal/mgr/group_test.go

@@ -51,6 +51,10 @@ func TestMachineSpecs(t *testing.T) {
 		{40, 8192, 40, "4c 8192m 40g"},
 		{5, 512, 10, "0.5c 512m 10g"},
 		{20, 1536, 20, "2c 1536m 20g"},
+		{20, 9600, 20, "2c 9600m 20g"}, // boundary stays MiB
+		{20, 10000, 20, "2c 10g 20g"},  // 9.77 -> 10
+		{20, 10240, 20, "2c 10g 20g"},  // exact GiB
+		{20, 11264, 20, "2c 11g 20g"},  // 11 GiB
 	} {
 		if got := MachineSpecs(test.cpu, test.mem, test.disk); got != test.want {
 			t.Errorf("MachineSpecs(%d, %d, %d) = %q, want %q", test.cpu, test.mem, test.disk, got, test.want)