Offer supply suggestions, drop the circuit column, center cells

The Versorgung field suggests ELT and MSR (plus values already used in
the balance) through a datalist and still accepts free text. The circuit
number column is not needed in early design phases; it is removed from
the data model, the regenerated migration 0010, the editor and the
print. All cells are centered except "Verbraucher / Flächen", group
titles and total labels.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/estimate-balance-frontend.test.ts

@@ -165,7 +165,6 @@ describe("estimate balance document editing", () => {
       id: "row-x",
       sortOrder: 3,
       supply: null,
-      circuitRef: null,
       name: "",
       quantity: 1,
       unit: "piece",
@@ -273,7 +272,6 @@ describe("estimate balance saving", () => {
     balance = updateEstimateRow(balance, "group-410", "row-a", {
       name: " Hebeanlage ",
       supply: " ELT ",
-      circuitRef: "",
       remark: "   ",
     });
     const saveable = toSaveableEstimateBalance(balance);
@@ -286,10 +284,9 @@ describe("estimate balance saving", () => {
       {
         name: saveable.groups[0]!.rows[0]!.name,
         supply: saveable.groups[0]!.rows[0]!.supply,
-        circuitRef: saveable.groups[0]!.rows[0]!.circuitRef,
         remark: saveable.groups[0]!.rows[0]!.remark,
       },
-      { name: "Hebeanlage", supply: "ELT", circuitRef: null, remark: null }
+      { name: "Hebeanlage", supply: "ELT", remark: null }
     );
   });
 

tests/estimate-balance.test.ts

@@ -52,7 +52,6 @@ function row(
     id: id(),
     sortOrder: 0,
     supply: "ELT",
-    circuitRef: null,
     name,
     quantity,
     unit: "piece",