fix(rgi): set application context before download attempt

Before downloading, now calls:
1. verifyCurrentActorAuthenticated — sets actor context in session
2. appdetail/details — loads application context

Then tries download regardless of fileVisibility result.
The session context might be what enables downloads that previously
returned 404.

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

src/app/api/eterra/rgi/download-doc/route.ts

@@ -34,7 +34,26 @@ export async function GET(req: NextRequest) {
 
     const client = await EterraClient.create(username, password);
 
-    // Try fileVisibility first (fast check)
+    // Step 0: Set application context (like the web UI does)
+    // This call sets session-level attributes required for document access
+    try {
+      await client.rgiGet(
+        `appDetail/verifyCurrentActorAuthenticated/${applicationId}/${workspaceId}`,
+      );
+    } catch {
+      // Non-critical
+    }
+
+    // Also load application details (sets more session context)
+    try {
+      await client.rgiPost(
+        `rgi/appdetail/details?applicationid=${applicationId}`,
+      );
+    } catch {
+      // Non-critical
+    }
+
+    // Try fileVisibility
     let available = false;
     if (documentTypeId) {
       try {
@@ -45,12 +64,11 @@ export async function GET(req: NextRequest) {
           available = true;
         }
       } catch {
-        // Not available server-side
+        // Not available — will try direct download anyway
       }
     }
 
-    // If fileVisibility passed, try download
-    if (available) {
+    // Try download (even if fileVisibility failed — context might be enough)
     try {
       const { data, contentType, filename } = await client.rgiDownload(
         `rgi/appdetail/loadDocument/downloadFile/${workspaceId}/${documentPk}`,
@@ -68,7 +86,6 @@ export async function GET(req: NextRequest) {
     } catch {
       // Fall through to redirect
     }
-    }
 
     // Server-side download not available — redirect to eTerra direct URL
     // User's browser session (if logged into eTerra) can download it