fix: TS build errors in cron.ts and CampaignDetail; serve at /magpie/

- cron.ts: cast split+map destructuring results to tuple types
  ([string,string,...] and [number,number]) — length guards already
  ensure these are safe; TypeScript just can't infer it from split()
- CampaignDetail: api.posts.trigger → api.posts.triggerSingle (correct name)
- .env.example: document sessions_dir + updated reddit_session_file default
- manage.sh build now produces a clean zero-warning dist

.env.example

@@ -16,8 +16,12 @@ DEBUG=false
 # Database location (default: ~/.local/share/magpie/magpie.db)
 # DB_PATH=/path/to/magpie.db
 
-# Session file location (default: ~/.local/share/magpie/session.json)
-# REDDIT_SESSION_FILE=/path/to/session.json
+# Sessions directory (multi-user layout: alan_reddit.json, cf_reddit.json, etc.)
+# SESSIONS_DIR=/home/youruser/.local/share/magpie/sessions
+
+# Default Reddit session file (backward compat; used by campaign scheduler)
+# Defaults to SESSIONS_DIR/alan_reddit.json — override if your setup differs.
+# REDDIT_SESSION_FILE=/home/youruser/.local/share/magpie/sessions/alan_reddit.json
 
 # APScheduler
 SCHEDULER_ENABLED=true

frontend/src/components/CampaignDetail.vue

@@ -240,7 +240,7 @@ onMounted(async () => {
 async function triggerSub(sub: string) {
   triggeringSub.value = sub
   try {
-    await api.posts.trigger(campaignId, sub)
+    await api.posts.triggerSingle(campaignId, sub)
     recentPosts.value = await api.posts.list(campaignId, undefined, 20)
   } catch (e: unknown) {
     toast.error(`Trigger failed for ${sub}: ${e instanceof Error ? e.message : 'Unknown error'}`)

frontend/src/utils/cron.ts

@@ -26,7 +26,7 @@ function parseDow(dow: string): string {
   }
   // Range: 1-5
   if (dow.includes('-')) {
-    const [start, end] = dow.split('-').map(Number)
+    const [start, end] = dow.split('-').map(Number) as [number, number]
     if (start === 1 && end === 5) return 'Weekdays'
     if (start === 0 && end === 6) return 'Every day'
     return `${DAYS[start]}-${DAYS[end]}`
@@ -45,7 +45,8 @@ export function humanizeCron(expr: string | null | undefined): string {
   const parts = expr.trim().split(/\s+/)
   if (parts.length !== 5) return expr
 
-  const [minute, hour, dom, month, dow] = parts
+  // Cast to tuple — length guard above guarantees all five are present.
+  const [minute, hour, dom, month, dow] = parts as [string, string, string, string, string]
 
   const everyMinute = minute === '*'
   const everyHour = hour === '*'