email-db tool: extract-attachment action, streaming, filename decoding, copy path fix

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

src/servers/api/email/email-db.ts

@@ -456,7 +456,16 @@ function parseAttachments(raw: string): AttachmentMeta[] {
 
     // Extract filename from Content-Disposition or Content-Type
     const fnMatch = headerBlock.match(/filename\*?=(?:"([^"]+)"|([^\s;]+))/i);
-    const filename = fnMatch ? (fnMatch[1] ?? fnMatch[2] ?? 'unknown') : 'unknown';
+    let rawFilename = fnMatch ? (fnMatch[1] ?? fnMatch[2] ?? 'unknown') : 'unknown';
+    // RFC 5987: filename*=charset''percent-encoded
+    const rfc5987Match = rawFilename.match(/^([^']*)'[^']*'(.+)/);
+    if (rfc5987Match) {
+      const cs = normalizeCharset(rfc5987Match[1]!.toLowerCase() || 'utf-8');
+      const encoded = rfc5987Match[2]!;
+      const bytes = encoded.replace(/%([0-9A-Fa-f]{2})/g, (_, h: string) => String.fromCharCode(parseInt(h, 16)));
+      rawFilename = new TextDecoder(cs, { fatal: false }).decode(Buffer.from(bytes, 'binary'));
+    }
+    const filename = decodeMimeWords(rawFilename);
 
     // Extract content-type
     const ctMatch = headerBlock.match(/^Content-Type:\s*([^\s;]+)/im);

src/workspaces/officerdev/src/apps/FileBrowser/FileBrowserApp/useFileBrowserApp.ts

@@ -384,12 +384,12 @@ export const useFileBrowserApp = (basePath: string, rootOverride?: string, initi
   };
 
   const handleCopyPath = (entry: DirEntry) => {
-    navigator.clipboard.writeText(absPath(entryPath(entry.name)));
+    navigator.clipboard.writeText(`~${entryPath(entry.name)}`);
     toast.success('Path copied');
   };
 
   const handleCopyCurrentPath = () => {
-    navigator.clipboard.writeText(absPath(currentPath));
+    navigator.clipboard.writeText(`~${currentPath}`);
     toast.success('Path copied');
   };