Expanded scheduled tasks + keyboard shortcuts

- scripts/run-task.sh: dispatcher for say / backup / snapshot-prune with
  safe arg handling (message stripped of CR/LF, integer-clamped keep
  count). Logs to ~/logs/mc-dashboard/tasks.log (falls back to /tmp).
- New /api/schedule/tasks GET/POST/DELETE route: stores tasks as
  crontab lines with `# mc-task:<base64(json)>` marker so the UI can
  round-trip them. Strict server-side validation:
    - Cron expression regex (5 fields, * / N / N-N / N,N / */N)
    - say message: 1–120 chars, no newlines/backticks/shell quotes
    - snapshot-prune keep: integer 1–50
    - task id: 16-hex only
  Single-quote-escaped message in the generated shell command.
- ScheduledTasks UI under ServerControls (alongside the existing single
  ScheduledRestart): pick type (Announce / Backup / Prune snapshots),
  preset schedule (daily at HH:MM or every N hours), adds with one
  click. Tasks list shows human-readable schedule + "next in Xh" hint
  computed client-side. Hover-reveal Remove action.
- Admin keyboard shortcuts: when not typing,
    r — refetch the active tab's query keys (toast feedback)
    / — focus the first input/contenteditable in the active panel
    ? — toast the shortcuts cheat sheet
  Chord-free, mirrors existing ⌘K palette and Esc handlers.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

components/AdminTabs.tsx

@@ -2,6 +2,8 @@
 
 import { useEffect, useState } from "react";
 import dynamic from "next/dynamic";
+import { useQueryClient } from "@tanstack/react-query";
+import { toast } from "sonner";
 import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
 import { ServerControls } from "@/components/ServerControls";
 import { Analytics } from "@/components/Analytics";
@@ -44,10 +46,60 @@ const TABS = [
   { value: "logs", label: "Logs" },
 ];
 
+const TAB_QUERIES: Record<string, string[]> = {
+  server: "status analytics schedule schedule-tasks".split(" "),
+  players: ["players"],
+  chat: ["chat"],
+  mods: "mods mod-updates snapshots".split(" "),
+  backups: ["backups"],
+  logs: ["logs"],
+};
+
 export function AdminTabs() {
+  const queryClient = useQueryClient();
   const [mounted, setMounted] = useState(false);
   const [value, setValue] = useState<string>("server");
 
+  useEffect(() => {
+    const isEditable = (el: Element | null) => {
+      if (!el) return false;
+      const tag = (el as HTMLElement).tagName;
+      if (tag === "INPUT" || tag === "TEXTAREA" || tag === "SELECT") return true;
+      return (el as HTMLElement).isContentEditable;
+    };
+
+    const onKey = (e: KeyboardEvent) => {
+      if (e.metaKey || e.ctrlKey || e.altKey) return;
+      if (isEditable(document.activeElement)) return;
+
+      if (e.key === "r") {
+        e.preventDefault();
+        const keys = TAB_QUERIES[value] || [];
+        keys.forEach((k) => {
+          queryClient.refetchQueries({ queryKey: [k] });
+        });
+        toast.success(`Refreshing ${value}...`, { duration: 1500 });
+      } else if (e.key === "/") {
+        const panel = document.querySelector(
+          '[data-slot="tabs-content"] input, [data-slot="tabs-content"] [contenteditable="true"]'
+        ) as HTMLElement | null;
+        if (panel) {
+          e.preventDefault();
+          panel.focus();
+        }
+      } else if (e.key === "?") {
+        e.preventDefault();
+        toast.message("Keyboard shortcuts", {
+          description:
+            "⌘K palette · r refresh · / focus search · Esc close · hash links jump tabs",
+          duration: 5000,
+        });
+      }
+    };
+    window.addEventListener("keydown", onKey);
+    return () => window.removeEventListener("keydown", onKey);
+  }, [value, queryClient]);
+
   useEffect(() => {
     setMounted(true);
     const hash = window.location.hash.replace("#", "");