fix(utilities): fix scale calculator logic, remove rooms tab

Scale calculator:
- Real→Desen: val(m) × 1000 ÷ scale = mm pe desen (ex: 5m la 1:100 → 50mm)
- Desen→Real: val(mm) × scale ÷ 1000 = m real (ex: 50mm la 1:100 → 5m)
- Previously both formulas were wrong (missing ×1000/÷1000 unit conversion)

Remove RoomAreaCalculator (not useful) and its tab/imports

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/modules/mini-utilities/components/mini-utilities-module.tsx

@@ -23,9 +23,6 @@ import {
   Unlock,
   PenTool,
   Maximize2,
-  LayoutGrid,
-  Plus,
-  X,
 } from "lucide-react";
 import { Button } from "@/shared/components/ui/button";
 import { Input } from "@/shared/components/ui/input";
@@ -2550,14 +2547,15 @@ function ScaleCalculator() {
     customScale !== "" ? parseFloat(customScale) || scale : scale;
   const val = parseFloat(inputVal);
 
+  // Real→Desen: val(m) × 1000 → mm, ÷ scale → mm pe desen
+  // Desen→Real: val(mm) × scale → mm real, ÷ 1000 → m
   const result = !isNaN(val)
     ? mode === "real-to-drawing"
-      ? val / effectiveScale
+      ? (val * 1000) / effectiveScale
-      : val * effectiveScale
+      : (val * effectiveScale) / 1000
     : NaN;
 
   const unitIn = mode === "real-to-drawing" ? "m (real)" : "mm (desen)";
-  const unitOut = mode === "real-to-drawing" ? "mm (desen)" : "m (real)";
 
   const fmtDesen = (n: number) =>
     isNaN(n)
@@ -2663,170 +2661,6 @@ function ScaleCalculator() {
   );
 }
 
-// ─── Calculator Camere ────────────────────────────────────────────────────────
-
-interface Room {
-  id: string;
-  name: string;
-  width: string;
-  length: string;
-  height: string;
-}
-
-function RoomAreaCalculator() {
-  const [rooms, setRooms] = useState<Room[]>([
-    { id: "1", name: "Living", width: "", length: "", height: "" },
-  ]);
-
-  const addRoom = () => {
-    setRooms((prev) => [
-      ...prev,
-      { id: String(Date.now()), name: "", width: "", length: "", height: "" },
-    ]);
-  };
-
-  const removeRoom = (id: string) => {
-    setRooms((prev) => prev.filter((r) => r.id !== id));
-  };
-
-  const updateRoom = (id: string, field: keyof Room, value: string) => {
-    setRooms((prev) =>
-      prev.map((r) => (r.id === id ? { ...r, [field]: value } : r)),
-    );
-  };
-
-  const roomsWithArea = rooms.map((r) => {
-    const w = parseFloat(r.width);
-    const l = parseFloat(r.length);
-    const h = parseFloat(r.height);
-    const area = !isNaN(w) && !isNaN(l) ? w * l : NaN;
-    const volume = !isNaN(area) && !isNaN(h) ? area * h : NaN;
-    return { ...r, area, volume };
-  });
-
-  const totalArea = roomsWithArea.reduce(
-    (sum, r) => (isNaN(r.area) ? sum : sum + r.area),
-    0,
-  );
-  const totalVolume = roomsWithArea.reduce(
-    (sum, r) => (isNaN(r.volume) ? sum : sum + r.volume),
-    0,
-  );
-
-  const fmtM2 = (n: number) =>
-    n.toLocaleString("ro-RO", { minimumFractionDigits: 2, maximumFractionDigits: 2 });
-
-  const copyAll = () => {
-    const lines = roomsWithArea
-      .filter((r) => !isNaN(r.area))
-      .map((r) => `${r.name || "Cameră"}: ${fmtM2(r.area)} m²`)
-      .join("\n");
-    const text = lines + `\n\nTotal: ${fmtM2(totalArea)} m²`;
-    navigator.clipboard.writeText(text).catch(() => {});
-  };
-
-  return (
-    <div className="space-y-4">
-      <div className="space-y-2">
-        {roomsWithArea.map((room, idx) => (
-          <div key={room.id} className="flex flex-wrap items-center gap-2 rounded border p-2">
-            <Input
-              placeholder={`Cameră ${idx + 1}`}
-              value={room.name}
-              onChange={(e) => updateRoom(room.id, "name", e.target.value)}
-              className="w-[130px] text-sm"
-            />
-            <div className="flex items-center gap-1">
-              <Input
-                type="number"
-                placeholder="L"
-                value={room.width}
-                onChange={(e) => updateRoom(room.id, "width", e.target.value)}
-                className="w-[80px] text-sm"
-                min={0}
-                step={0.01}
-              />
-              <span className="text-muted-foreground text-xs">×</span>
-              <Input
-                type="number"
-                placeholder="l"
-                value={room.length}
-                onChange={(e) => updateRoom(room.id, "length", e.target.value)}
-                className="w-[80px] text-sm"
-                min={0}
-                step={0.01}
-              />
-              <span className="text-muted-foreground text-xs">m</span>
-            </div>
-            <div className="flex items-center gap-1">
-              <Input
-                type="number"
-                placeholder="H"
-                value={room.height}
-                onChange={(e) => updateRoom(room.id, "height", e.target.value)}
-                className="w-[70px] text-sm"
-                min={0}
-                step={0.01}
-              />
-              <span className="text-muted-foreground text-xs">m</span>
-            </div>
-            {!isNaN(room.area) && (
-              <span className="text-sm font-medium text-primary min-w-[80px]">
-                {fmtM2(room.area)} m²
-                {!isNaN(room.volume) && (
-                  <span className="block text-[10px] text-muted-foreground font-normal">
-                    {fmtM2(room.volume)} m³
-                  </span>
-                )}
-              </span>
-            )}
-            <Button
-              type="button"
-              variant="ghost"
-              size="icon"
-              className="h-7 w-7 text-destructive ml-auto"
-              onClick={() => removeRoom(room.id)}
-              disabled={rooms.length === 1}
-            >
-              <X className="h-3.5 w-3.5" />
-            </Button>
-          </div>
-        ))}
-      </div>
-      <div className="flex gap-2">
-        <Button type="button" variant="outline" size="sm" onClick={addRoom}>
-          <Plus className="mr-1 h-3 w-3" /> Adaugă cameră
-        </Button>
-      </div>
-      {totalArea > 0 && (
-        <div className="rounded-md border bg-muted/30 p-4 space-y-1 text-sm">
-          <div className="flex items-center justify-between">
-            <span className="font-medium">
-              Total suprafață:{" "}
-              <strong className="text-primary">{fmtM2(totalArea)} m²</strong>
-            </span>
-            <CopyButton text={fmtM2(totalArea)} />
-          </div>
-          {totalVolume > 0 && (
-            <p className="text-xs text-muted-foreground">
-              Volum total: {fmtM2(totalVolume)} m³
-            </p>
-          )}
-          <Button
-            type="button"
-            variant="outline"
-            size="sm"
-            className="mt-2"
-            onClick={copyAll}
-          >
-            <Copy className="mr-1 h-3 w-3" /> Copiază tot
-          </Button>
-        </div>
-      )}
-    </div>
-  );
-}
-
 // ─── Main Module ──────────────────────────────────────────────────────────────
 
 export function MiniUtilitiesModule() {
@@ -2865,9 +2699,6 @@ export function MiniUtilitiesModule() {
           <TabsTrigger value="scale">
             <Maximize2 className="mr-1.5 h-3.5 w-3.5" /> Scară
           </TabsTrigger>
-          <TabsTrigger value="rooms">
-            <LayoutGrid className="mr-1.5 h-3.5 w-3.5" /> Camere
-          </TabsTrigger>
         </TabsList>
         <TabsList className="flex h-auto flex-wrap gap-1 rounded-lg bg-muted/50 p-1">
           {/* ── Documente & Unelte ── */}
@@ -3062,16 +2893,6 @@ export function MiniUtilitiesModule() {
           </CardContent>
         </Card>
       </TabsContent>
-      <TabsContent value="rooms">
-        <Card>
-          <CardHeader>
-            <CardTitle className="text-base">Calculator suprafețe camere</CardTitle>
-          </CardHeader>
-          <CardContent>
-            <RoomAreaCalculator />
-          </CardContent>
-        </Card>
-      </TabsContent>
     </Tabs>
   );
 }