docs(manual): exportar manual de usuario a PDF

docs/manual/pdf.css

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+/* Estilo de impresión del manual de usuario de recordaLexia. */
+@page {
+  size: A4;
+  margin: 2cm 1.8cm;
+  @bottom-center { content: "recordaLexia · Manual de usuario"; font-size: 8pt; color: #9aa0ad; }
+  @bottom-right { content: counter(page) " / " counter(pages); font-size: 8pt; color: #9aa0ad; }
+}
+
+body {
+  font-family: "Nunito", "Helvetica Neue", Arial, sans-serif;
+  color: #2A3142;
+  font-size: 10.5pt;
+  line-height: 1.5;
+}
+
+h1, h2, h3 {
+  font-family: "Fredoka", "Nunito", Arial, sans-serif;
+  color: #2A3142;
+  line-height: 1.2;
+}
+h1 { font-size: 22pt; color: #5B8DEF; border-bottom: 3px solid #F2A65A; padding-bottom: 6px; }
+h2 { font-size: 15pt; margin-top: 1.4em; border-left: 5px solid #A78BD0; padding-left: 10px; }
+h3 { font-size: 12.5pt; color: #5B8DEF; margin-top: 1.1em; }
+
+/* Cada sección de primer nivel (## n.) empieza en página nueva, salvo la primera. */
+h2 { break-before: page; }
+h2:first-of-type { break-before: avoid; }
+
+img {
+  max-width: 78%;
+  display: block;
+  margin: 12px auto;
+  border: 1px solid #e6e8ee;
+  border-radius: 12px;
+  box-shadow: 0 2px 8px rgba(42,49,66,0.08);
+}
+
+blockquote {
+  background: #FFF6E0;
+  border-left: 4px solid #F4C95D;
+  margin: 12px 0;
+  padding: 8px 14px;
+  border-radius: 6px;
+  color: #5a4a1f;
+}
+
+table { border-collapse: collapse; width: 100%; margin: 10px 0; font-size: 9.5pt; }
+th, td { border: 1px solid #e0e3ea; padding: 6px 10px; text-align: left; }
+th { background: #5B8DEF; color: #fff; }
+tr:nth-child(even) td { background: #f6f8fc; }
+
+code { background: #f0f2f6; padding: 1px 5px; border-radius: 4px; font-size: 9.5pt; }
+a { color: #5B8DEF; text-decoration: none; }