polish: logo version line, clean empty-state flows in calendar

- printLogo(): add dim "@nbtca/prompt v{version}" under tagline so npx
  users immediately see which package and version they are running
- showEventsPreview(): early return on empty state — avoid rendering the
  empty table (redundant with the spinner message that already says it)
- showCalendar(): move empty check before table render — heatmap still
  shown (past activity is useful even with no upcoming events), table
  and selector only rendered when there are events
- showPastEvents(): same early-return pattern for empty state
- Remove unused `info` import from calendar.ts

Author: m1ngsama

src/core/logo.ts

@@ -7,8 +7,10 @@
 import { readFileSync } from 'fs';
 import { fileURLToPath } from 'url';
 import { dirname, join } from 'path';
+import chalk from 'chalk';
 import gradient from 'gradient-string';
 import { useUnicodeIcons } from './icons.js';
+import { APP_INFO } from '../config/data.js';
 
 const __dirname = dirname(fileURLToPath(import.meta.url));
 
@@ -49,5 +51,6 @@ export function printLogo(): void {
   console.log(paint(art ?? 'NBTCA', color));
   console.log();
   console.log(color ? brand(TAGLINE) : TAGLINE);
+  console.log(chalk.dim(`@nbtca/prompt  v${APP_INFO.version}`));
   console.log();
 }

src/features/calendar.ts

@@ -2,7 +2,7 @@ import { loadCalendar, FeedFetchError, FeedParseError } from '@nbtca/nbtcal';
 import type { Calendar, CalendarEvent, HeatmapBucket } from '@nbtca/nbtcal';
 import chalk from 'chalk';
 import { select, isCancel } from '@clack/prompts';
-import { info, createSpinner } from '../core/ui.js';
+import { createSpinner } from '../core/ui.js';
 import { c } from '../core/theme.js';
 import { pickIcon } from '../core/icons.js';
 import { padEndV, truncate } from '../core/text.js';
@@ -160,14 +160,15 @@ export async function showEventsPreview(): Promise<void> {
 
     if (events.length === 0) {
       s.stop(trans.calendar.noEvents);
-    } else {
-      s.stop(`${events.length} ${trans.calendar.eventsFound}`);
+      console.log();
+      return;
     }
 
+    s.stop(`${events.length} ${trans.calendar.eventsFound}`);
     console.log();
     console.log(renderEventsTable(events.slice(0, 5), { color: !!process.stdout.isTTY }));
     console.log();
-    if (events.length > 0) renderSubscribeHint();
+    renderSubscribeHint();
     console.log();
   } catch {
     s.error(trans.calendar.error);
@@ -198,17 +199,18 @@ export async function showPastEvents(): Promise<void> {
   try {
     const cal = await loadCalendarOrThrow();
     const events = cal.past({ days: 30 }).reverse().map(toDisplayEvent);
-    s.stop(`${events.length} ${trans.calendar.eventsFound}`);
-
-    console.log();
-    console.log(renderEventsTable(events, { color: true }));
-    console.log();
 
     if (events.length === 0) {
-      info(trans.calendar.noPastEvents);
+      s.stop(trans.calendar.noPastEvents);
+      console.log();
       return;
     }
 
+    s.stop(`${events.length} ${trans.calendar.eventsFound}`);
+    console.log();
+    console.log(renderEventsTable(events, { color: true }));
+    console.log();
+
     const options = [
       ...events.map((e, i) => ({
         value: String(i),
@@ -237,14 +239,23 @@ export async function showCalendar(): Promise<void> {
   try {
     const cal = await loadCalendarOrThrow();
     const events = cal.upcoming({ days: 30 }).map(toDisplayEvent);
-    s.stop(`${events.length} ${trans.calendar.eventsFound}`);
 
     const now = new Date();
     const heatmapBuckets = cal.heatmap({
       start: new Date(now.getTime() - 365 * 24 * 60 * 60 * 1000),
       end: now,
       bucket: 'day',
     });
+
+    if (events.length === 0) {
+      s.stop(trans.calendar.noEvents);
+      console.log();
+      console.log(renderHeatmap(heatmapBuckets, now, { color: true }));
+      console.log();
+      return;
+    }
+
+    s.stop(`${events.length} ${trans.calendar.eventsFound}`);
     console.log();
     console.log(renderHeatmap(heatmapBuckets, now, { color: true }));
     console.log();
@@ -253,11 +264,6 @@ export async function showCalendar(): Promise<void> {
     renderSubscribeHint();
     console.log();
 
-    if (events.length === 0) {
-      info(trans.calendar.noEvents);
-      return;
-    }
-
     const options = [
       ...events.map((e, i) => ({
         value: String(i),