fix(attachments): default download inline limit off (use export cache)

PEARCORD_ATTACHMENT_DOWNLOAD_MAX=0 sends full files via download-cache path.

Co-authored-by: Cursor <[email protected]>

index.js

@@ -1408,7 +1408,11 @@ async function dispatchUiMessage (platform, msg, hooks = {}) {
   if (t === 'request-attachment-download') {
     const attachmentId = msg.attachmentId
     const downloadTimeoutMs = Number(process.env.PEARCORD_ATTACHMENT_DOWNLOAD_MS || 30000)
-    const maxInlineBytes = Number(process.env.PEARCORD_ATTACHMENT_DOWNLOAD_MAX || 512 * 1024)
+    const maxInlineRaw = process.env.PEARCORD_ATTACHMENT_DOWNLOAD_MAX
+    const maxInlineBytes =
+      maxInlineRaw === undefined || maxInlineRaw === '' || maxInlineRaw === '0'
+        ? 0
+        : Number(maxInlineRaw)
     const sendDownloadError = (message) => {
       try {
         send({
@@ -1428,7 +1432,7 @@ async function dispatchUiMessage (platform, msg, hooks = {}) {
         })
       ])
       if (!exported?.filePath) throw new Error('attachment file empty')
-      if (exported.size > maxInlineBytes) {
+      if (maxInlineBytes > 0 && exported.size > maxInlineBytes) {
         try {
           send({
             type: 'attachment-download-saved',