timezone: parseo UTC Teams + conversion Colombia + doc RUMBO

- services/timezone.ts: parseTeamsUTC(), toColombiaTime(), isTeamsFile()
- TranscriptionsView: fecha prioriza UTC del filename sobre AI/hoy
- TranscriptionsView: muestra conversion UTC → Colombia en resultados
- rumbo/timezone.md: documentacion arquitectura horaria para RUMBO

src/services/timezone.ts

@@ -0,0 +1,53 @@
+/**
+ * Utilidades de huso horario para Alpha.
+ *
+ * Colombia: UTC-5 (sin horario de verano).
+ * Microsoft Teams transcripts incluyen UTC en el filename.
+ */
+
+const COLOMBIA_OFFSET = -5 // UTC-5
+
+/**
+ * Parsea timestamp UTC desde filename de Microsoft Teams.
+ * Formato: "305 Equilibrium Logicas Dashboard Informes-20260525_185916UTC-Meeting Recording"
+ *                                                         ^^^^^^^^^^^^^^^^^^^^
+ * Devuelve: { dateStr: "2026-05-25", timeStr: "13:59", utc: "18:59" }
+ */
+export function parseTeamsUTC(filename: string): { dateStr: string; timeStr: string; utc: string } | null {
+  // Busca patrón YYYYMMDD_HHMMSSUTC
+  const match = filename.match(/(\d{4})(\d{2})(\d{2})_(\d{2})(\d{2})(\d{2})UTC/)
+  if (!match) return null
+
+  const [, y, m, d, hh, mm] = match
+
+  // Crear fecha UTC
+  const utcDate = new Date(Date.UTC(Number(y), Number(m) - 1, Number(d), Number(hh), Number(mm)))
+
+  // Convertir a Colombia (UTC-5)
+  const colombia = new Date(utcDate.getTime() + COLOMBIA_OFFSET * 3600000)
+
+  const pad2 = (n: number) => String(n).padStart(2, '0')
+
+  const dateStr = `${colombia.getFullYear()}-${pad2(colombia.getMonth() + 1)}-${pad2(colombia.getDate())}`
+  const timeStr = `${pad2(colombia.getHours())}:${pad2(colombia.getMinutes())}`
+  const utcStr = `${hh}:${mm}`
+
+  return { dateStr, timeStr, utc: utcStr }
+}
+
+/**
+ * Detecta si el filename es de Microsoft Teams.
+ */
+export function isTeamsFile(filename: string): boolean {
+  return /Meetings?\s*(Recording|Transcript)/i.test(filename) || /^\d{8}_\d{6}UTC/.test(filename)
+}
+
+/**
+ * Convierte una fecha UTC a string en hora Colombia.
+ */
+export function toColombiaTime(isoString: string): string {
+  const d = new Date(isoString)
+  const col = new Date(d.getTime() + COLOMBIA_OFFSET * 3600000)
+  const pad2 = (n: number) => String(n).padStart(2, '0')
+  return `${col.getFullYear()}-${pad2(col.getMonth() + 1)}-${pad2(col.getDate())} ${pad2(col.getHours())}:${pad2(col.getMinutes())}`
+}