Add manual pension data entry and fix chart to use real historical data

- Add paste-and-preview modal for entering pension fund balances from bank website
- Backend upsert logic so n8n PDF uploads overwrite manual entries
- Chart now shows actual snapshot data with dynamic month labels
- New POST /pensions/manual endpoint for JSON-based fund entry

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/lib/parsePensionPaste.ts

@@ -0,0 +1,133 @@
+export interface PensionParsedEntry {
+  fund: string;
+  period_start: string; // YYYY-MM-DD
+  period_end: string;
+  saldo_anterior: number;
+  aportes: number;
+  rendimientos: number;
+  retiros: number;
+  traslados: number;
+  comision: number;
+  correccion: number;
+  bonificacion: number;
+  saldo_final: number;
+}
+
+function parseAmount(raw: string): number {
+  // "¢ 18,684,764.98" or "¢ -552,213.24" or just "18,684,764.98"
+  const cleaned = raw.replace(/[¢\s]/g, '').replace(/,/g, '');
+  const num = parseFloat(cleaned);
+  return isNaN(num) ? 0 : num;
+}
+
+function parseDateDMY(raw: string): string {
+  // "01/03/2026" → "2026-03-01"
+  const m = raw.match(/(\d{2})\/(\d{2})\/(\d{4})/);
+  if (!m) return '';
+  return `${m[3]}-${m[2]}-${m[1]}`;
+}
+
+function extractAmounts(line: string): number[] {
+  const matches = line.match(/¢\s*-?[\d,.]+/g);
+  if (!matches) return [];
+  return matches.map(parseAmount);
+}
+
+interface BlockResult {
+  funds: string[];
+  fields: Record<string, number[]>;
+  period_start: string;
+  period_end: string;
+}
+
+function parseBlock(lines: string[]): BlockResult | null {
+  const result: BlockResult = {
+    funds: [],
+    fields: {},
+    period_start: '',
+    period_end: '',
+  };
+
+  // Detect fund columns from header
+  const headerLine = lines.find((l) => /resumen del per[ií]odo/i.test(l));
+  if (!headerLine) return null;
+
+  if (/\bROP\b/i.test(headerLine) && /\bFCL\b/i.test(headerLine)) {
+    result.funds = ['ROP', 'FCL'];
+  } else if (/voluntario/i.test(headerLine) || /\bVOL\b/i.test(headerLine)) {
+    result.funds = ['VOL'];
+  } else {
+    return null;
+  }
+
+  const fieldMap: [RegExp, string][] = [
+    [/saldo\s*anterior/i, 'saldo_anterior'],
+    [/aportes/i, 'aportes'],
+    [/rendimientos/i, 'rendimientos'],
+    [/retiros/i, 'retiros'],
+    [/traslados/i, 'traslados'],
+    [/comisi[oó]n/i, 'comision'],
+    [/bonificaci[oó]n/i, 'bonificacion'],
+    [/saldo\s*actual/i, 'saldo_final'],
+  ];
+
+  for (const line of lines) {
+    for (const [regex, key] of fieldMap) {
+      if (regex.test(line)) {
+        const amounts = extractAmounts(line);
+        if (amounts.length > 0) {
+          result.fields[key] = amounts;
+        }
+      }
+    }
+
+    // Period
+    const periodMatch = line.match(/del\s+(\d{2}\/\d{2}\/\d{4})\s+al\s+(\d{2}\/\d{2}\/\d{4})/i);
+    if (periodMatch) {
+      result.period_start = parseDateDMY(periodMatch[1]);
+      result.period_end = parseDateDMY(periodMatch[2]);
+    }
+  }
+
+  return result;
+}
+
+export function parsePensionPaste(text: string): PensionParsedEntry[] {
+  // Split into blocks by "---" or multiple blank lines
+  const blocks = text.split(/(?:^|\n)-{3,}(?:\n|$)|\n{3,}/);
+  const entries: PensionParsedEntry[] = [];
+
+  for (const block of blocks) {
+    const lines = block.split('\n').filter((l) => l.trim());
+    if (lines.length < 3) continue;
+
+    const parsed = parseBlock(lines);
+    if (!parsed || !parsed.period_start || !parsed.period_end) continue;
+
+    for (let i = 0; i < parsed.funds.length; i++) {
+      const fund = parsed.funds[i];
+      const get = (key: string): number => {
+        const vals = parsed.fields[key];
+        if (!vals) return 0;
+        return vals[i] ?? vals[0] ?? 0;
+      };
+
+      entries.push({
+        fund,
+        period_start: parsed.period_start,
+        period_end: parsed.period_end,
+        saldo_anterior: get('saldo_anterior'),
+        aportes: get('aportes'),
+        rendimientos: get('rendimientos'),
+        retiros: get('retiros'),
+        traslados: get('traslados'),
+        comision: get('comision'),
+        correccion: 0,
+        bonificacion: get('bonificacion'),
+        saldo_final: get('saldo_final'),
+      });
+    }
+  }
+
+  return entries;
+}