SSE events bridge, PWA service worker, offline banner, lazy admin tabs

- New /api/events SSE endpoint (authed): pushes status every 5s and chat
  on log-file mtime change (~1.5s poll). Heartbeat every 15s, hard-caps
  each stream at 10min so the browser gets a clean auth refresh on
  reconnect. Auto-aborts on client disconnect.
- Factored shared helpers out of the existing routes:
  - lib/server-status.ts (probeStatus, reused by /api/status + SSE)
  - lib/chat-log.ts (parseLogLine, readChatMessages, logMtime, reused by
    /api/chat + SSE)
- EventsBridge client (mounted in Providers) opens one EventSource per
  authed session and writes live data into the TanStack Query cache for
  ["status"] and ["chat"] — no refactor needed in consuming components,
  they keep reading their usual query keys.
- Now that SSE pushes updates, polling intervals bumped: StatusCard and
  ServerControls 10s -> 60s, ChatBridge 5s -> 30s. SSE handles realtime,
  polling is safety fallback.
- OfflineBanner: sticky amber bar when navigator.onLine flips false.
- PWA: minimal public/sw.js with shell + asset cache (network-first for
  HTML, stale-while-revalidate for static assets, never touches /api/*
  or text/event-stream). ServiceWorkerRegister client registers it in
  production only.
- AdminTabs now uses next/dynamic with skeleton fallbacks for Players /
  Chat / Mods / Backups / Logs, keeping initial /admin bundle smaller.

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

lib/chat-log.ts

@@ -0,0 +1,74 @@
+import { readFileSync, existsSync, statSync } from "fs";
+
+export const LOG_FILE = "/home/minecraft/server/logs/latest.log";
+
+export type ChatMessage = {
+  time: string;
+  type: "chat" | "join" | "leave" | "death" | "server";
+  player: string;
+  message: string;
+};
+
+export function parseLogLine(line: string): ChatMessage | null {
+  const chatMatch = line.match(
+    /\[(\d{2}:\d{2}:\d{2})\].*\[minecraft\/(?:DedicatedServer|MinecraftServer)\]:\s*<(\w+)>\s*(.*)/
+  );
+  if (chatMatch) {
+    return { time: chatMatch[1], type: "chat", player: chatMatch[2], message: chatMatch[3] };
+  }
+
+  const joinMatch = line.match(
+    /\[(\d{2}:\d{2}:\d{2})\].*\[minecraft\/(?:PlayerList|ServerPlayer)\]:\s*(\w+)\s+joined the game/
+  );
+  if (joinMatch) {
+    return { time: joinMatch[1], type: "join", player: joinMatch[2], message: "joined the game" };
+  }
+
+  const leaveMatch = line.match(
+    /\[(\d{2}:\d{2}:\d{2})\].*\[minecraft\/(?:PlayerList|ServerPlayer)\]:\s*(\w+)\s+left the game/
+  );
+  if (leaveMatch) {
+    return { time: leaveMatch[1], type: "leave", player: leaveMatch[2], message: "left the game" };
+  }
+
+  const deathMatch = line.match(
+    /\[(\d{2}:\d{2}:\d{2})\].*\[minecraft\/(?:DedicatedServer|MinecraftServer)\]:\s*(\w+)\s+(was |died|drowned|burned|fell|starved|suffocated|hit|blew|withered|tried|experienced|went|walked|froze|was prick|was stung|was impaled|was squashed|was skewered|was squished|was pummeled|discovered)(.*)/
+  );
+  if (deathMatch) {
+    return {
+      time: deathMatch[1],
+      type: "death",
+      player: deathMatch[2],
+      message: deathMatch[3] + (deathMatch[4] || ""),
+    };
+  }
+
+  const sayMatch = line.match(
+    /\[(\d{2}:\d{2}:\d{2})\].*\[minecraft\/(?:DedicatedServer|MinecraftServer)\]:\s*\[Server\]\s*(.*)/
+  );
+  if (sayMatch) {
+    return { time: sayMatch[1], type: "server", player: "Server", message: sayMatch[2] };
+  }
+
+  return null;
+}
+
+export function readChatMessages(maxLines = 50): ChatMessage[] {
+  if (!existsSync(LOG_FILE)) return [];
+  const content = readFileSync(LOG_FILE, "utf8");
+  const lines = content.split("\n");
+  const messages: ChatMessage[] = [];
+  for (let i = lines.length - 1; i >= 0 && messages.length < maxLines; i--) {
+    const msg = parseLogLine(lines[i]);
+    if (msg) messages.unshift(msg);
+  }
+  return messages;
+}
+
+export function logMtime(): number {
+  try {
+    return statSync(LOG_FILE).mtimeMs;
+  } catch {
+    return 0;
+  }
+}