fix: Giveaway bugs

apps/bot/src/modules/giveaways/service.ts

@@ -59,6 +59,11 @@ function requirementLines(locale: 'de' | 'en', giveaway: Giveaway): string[] {
 
 export function buildGiveawayEmbed(locale: 'de' | 'en', giveaway: Giveaway): EmbedBuilder {
   const ended = giveaway.endedAt !== null;
+  const endsAtUnix = Math.floor(giveaway.endsAt.getTime() / 1000);
+  // Discord does not parse <t:…> timestamps in embed footers — only in
+  // description/fields/content. Keep relative + absolute for clarity.
+  const endsAtText = `<t:${endsAtUnix}:R> (<t:${endsAtUnix}:f>)`;
+
   const embed = new EmbedBuilder()
     .setTitle(t(locale, 'giveaway.embed.title'))
     .setColor(ended ? 0x6b7280 : 0x6366f1)
@@ -86,19 +91,17 @@ export function buildGiveawayEmbed(locale: 'de' | 'en', giveaway: Giveaway): Emb
     );
     embed.setFooter({ text: t(locale, 'giveaway.embed.ended') });
   } else if (giveaway.paused) {
-    embed.setDescription(t(locale, 'giveaway.embed.paused'));
-    embed.setFooter({
-      text: tf(locale, 'giveaway.embed.endsAt', {
-        time: `<t:${Math.floor(giveaway.endsAt.getTime() / 1000)}:R>`
-      })
-    });
+    embed.setDescription(
+      `${t(locale, 'giveaway.embed.paused')}\n\n${tf(locale, 'giveaway.embed.endsAt', {
+        time: endsAtText
+      })}`
+    );
   } else {
-    embed.setDescription(t(locale, 'giveaway.embed.active'));
-    embed.setFooter({
-      text: tf(locale, 'giveaway.embed.endsAt', {
-        time: `<t:${Math.floor(giveaway.endsAt.getTime() / 1000)}:R>`
-      })
-    });
+    embed.setDescription(
+      `${t(locale, 'giveaway.embed.active')}\n\n${tf(locale, 'giveaway.embed.endsAt', {
+        time: endsAtText
+      })}`
+    );
   }
 
   const requirements = requirementLines(locale, giveaway);
@@ -313,10 +316,13 @@ async function dmWinners(
   }
 }
 
-export async function endGiveaway(context: BotContext, giveawayId: string): Promise<void> {
+export async function endGiveaway(context: BotContext, giveawayId: string): Promise<Giveaway> {
   const giveaway = await context.prisma.giveaway.findUnique({ where: { id: giveawayId } });
-  if (!giveaway || giveaway.endedAt) {
-    return;
+  if (!giveaway) {
+    throw new GiveawayError('not_found');
+  }
+  if (giveaway.endedAt) {
+    throw new GiveawayError('already_ended');
   }
 
   await cancelGiveawayJob(giveawayId);
@@ -338,6 +344,7 @@ export async function endGiveaway(context: BotContext, giveawayId: string): Prom
   if (winners.length > 0) {
     await dmWinners(context, updated, winners, locale);
   }
+  return updated;
 }
 
 export async function rerollGiveaway(