fix: address PR #305 review comments — Origin header, lowServerCount threshold, keepalive guard

- history.ts: add Origin: DEFAULT_ORIGIN to CDN DELETE request headers —
  the download path injects it internally but options does not carry it
- socket.ts: fix lowServerCount comparison — was preKeyCount <= topUpAmount
  which triggered uploads even when above MIN_PREKEY_COUNT (e.g. 250 prekeys
  → topUp=550 → 250<=550=true → unnecessary upload). Now uses correct
  threshold: preKeyCount < MIN_PREKEY_COUNT
- socket.ts: guard scheduleNextKeepAlive() with !closed check to prevent
  orphan timers when end() was called concurrently on a different path

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/Socket/socket.ts

@@ -786,14 +786,15 @@ export const makeSocket = (config: SocketConfig) => {
 		try {
 			let count = 0
 			const preKeyCount = await getAvailablePreKeysOnServer()
-			if (preKeyCount === 0) count = INITIAL_PREKEY_COUNT
+			// How many to upload: top-up to INITIAL_PREKEY_COUNT from whatever remains on server
-			else count = Math.max(0, INITIAL_PREKEY_COUNT - preKeyCount)
+			count = Math.max(0, INITIAL_PREKEY_COUNT - preKeyCount)
 			const { exists: currentPreKeyExists, currentPreKeyId } = await verifyCurrentPreKeyExists()
 
 			logger.info(`${preKeyCount} pre-keys found on server`)
 			logger.info(`Current prekey ID: ${currentPreKeyId}, exists in storage: ${currentPreKeyExists}`)
 
-			const lowServerCount = preKeyCount <= count
+			// Trigger upload when below the replenishment threshold, not when count < topUp amount
+			const lowServerCount = preKeyCount < MIN_PREKEY_COUNT
 			const missingCurrentPreKey = !currentPreKeyExists && currentPreKeyId > 0
 
 			const shouldUpload = lowServerCount || missingCurrentPreKey
@@ -1309,7 +1310,10 @@ export const makeSocket = (config: SocketConfig) => {
 				logger.warn('keep alive called when WS not open')
 			}
 
-			scheduleNextKeepAlive()
+			// Do not reschedule once shutdown has started (closed set by end() on any concurrent path)
+			if (!closed) {
+				scheduleNextKeepAlive()
+			}
 		}
 
 		scheduleNextKeepAlive()

src/Utils/history.ts

@@ -15,6 +15,7 @@ import {
 import { toNumber } from './generics'
 import type { ILogger } from './logger.js'
 import { normalizeMessageContent } from './messages'
+import { DEFAULT_ORIGIN } from '../Defaults'
 import { downloadContentFromMessage, getUrlFromDirectPath } from './messages-media'
 
 const inflatePromise = promisify(inflate)
@@ -430,7 +431,11 @@ export const downloadAndProcessHistorySyncNotification = async (
 	// processing throws — the server copy would be gone and retry after reconnect would fail.
 	if (msg.directPath) {
 		const cdnUrl = getUrlFromDirectPath(msg.directPath)
-		fetch(cdnUrl, { ...options, method: 'DELETE' }).catch(() => {
+		fetch(cdnUrl, {
+			...options,
+			method: 'DELETE',
+			headers: { ...((options as RequestInit).headers ?? {}), Origin: DEFAULT_ORIGIN }
+		}).catch(() => {
 			// non-fatal — server will expire it anyway
 		})
 	}