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>

src/frontend/estimate-balance/estimate-balance-document.ts

@@ -18,7 +18,6 @@ export const estimateTextLimits = {
   groupTitle: 200,
   groupEditor: 100,
   supply: 50,
-  circuitRef: 50,
   rowName: 200,
   remark: 500,
 } as const;
@@ -34,7 +33,6 @@ export function createEstimateRow(
     id: createId(),
     sortOrder,
     supply: null,
-    circuitRef: null,
     name: "",
     quantity: 1,
     unit: "piece",
@@ -257,7 +255,6 @@ export function toSaveableEstimateBalance(
         id: row.id,
         sortOrder: row.sortOrder,
         supply: optionalText(row.supply),
-        circuitRef: optionalText(row.circuitRef),
         name: requiredText(row.name),
         quantity: row.quantity,
         unit: row.unit,

src/frontend/estimate-balance/estimate-balance-sheet.tsx

@@ -50,8 +50,12 @@ interface EstimateBalanceSheetProps {
 }
 
 // Leading columns up to cos φ; the power columns follow.
-const LEADING_COLUMN_COUNT = 10;
-const COLUMN_COUNT = 17;
+const LEADING_COLUMN_COUNT = 9;
+const COLUMN_COUNT = 16;
+
+/** Suggested supply values; free text stays possible. */
+const SUPPLY_SUGGESTIONS = ["ELT", "MSR"];
+const SUPPLY_LIST_ID = "estimate-supply-options";
 
 function NumberInput({
   ariaLabel,
@@ -85,9 +89,17 @@ function NumberInput({
   );
 }
 
+function supplyOptions(balance: EstimateBalanceSnapshot): string[] {
+  const used = balance.groups.flatMap((group) =>
+    group.rows.map((row) => row.supply?.trim() ?? "")
+  );
+  return [...new Set([...SUPPLY_SUGGESTIONS, ...used.filter(Boolean)])];
+}
+
 function TextInput({
   ariaLabel,
   disabled,
+  list,
   maxLength,
   onChange,
   placeholder,
@@ -95,6 +107,7 @@ function TextInput({
 }: {
   ariaLabel: string;
   disabled: boolean;
+  list?: string;
   maxLength: number;
   onChange: (value: string) => void;
   placeholder?: string;
@@ -106,6 +119,7 @@ function TextInput({
         aria-label={ariaLabel}
         className="estimate-cell-input"
         disabled={disabled}
+        list={list}
         maxLength={maxLength}
         onChange={(event) => onChange(event.target.value)}
         placeholder={placeholder}
@@ -189,22 +203,14 @@ function EstimateRowLine({
         <TextInput
           ariaLabel={`Versorgung (${rowLabel})`}
           disabled={disabled}
+          list={SUPPLY_LIST_ID}
           maxLength={estimateTextLimits.supply}
           onChange={(supply) => patch({ supply })}
           placeholder="ELT"
           value={row.supply}
         />
       </td>
-      <td>
-        <TextInput
-          ariaLabel={`Stromkreis-Nr. (${rowLabel})`}
-          disabled={disabled}
-          maxLength={estimateTextLimits.circuitRef}
-          onChange={(circuitRef) => patch({ circuitRef })}
-          value={row.circuitRef}
-        />
-      </td>
-      <td>
+      <td className="estimate-name-cell">
         <TextInput
           ariaLabel={`Verbraucher / Fläche (${rowLabel})`}
           disabled={disabled}
@@ -384,11 +390,15 @@ export function EstimateBalanceSheet({
 
   return (
     <div className="estimate-sheet-wrap">
+      <datalist id={SUPPLY_LIST_ID}>
+        {supplyOptions(balance).map((supply) => (
+          <option key={supply} value={supply} />
+        ))}
+      </datalist>
       <table className="estimate-sheet">
         <colgroup>
           <col className="estimate-col-kg" />
           <col className="estimate-col-supply" />
-          <col className="estimate-col-circuit" />
           <col className="estimate-col-name" />
           <col className="estimate-col-quantity" />
           <col className="estimate-col-unit" />
@@ -409,9 +419,8 @@ export function EstimateBalanceSheet({
             <th rowSpan={2}>KG</th>
             <th rowSpan={2}>
               Versorgung
-              <span className="estimate-th-hint">ELT/ISP …</span>
+              <span className="estimate-th-hint">ELT/MSR …</span>
             </th>
-            <th rowSpan={2}>Stromkreis-Nr.</th>
             <th rowSpan={2}>Verbraucher / Flächen</th>
             <th colSpan={2}>
               Anzahl / Fläche