fix: resolve brand brief routing conflict (/briefs/new → /brand/briefs/new)

.claude/memory/iterations.md

@@ -452,3 +452,19 @@ Public:
 - lib/utils.ts
 
 **Issues found**: None. No fixes were required.
+
+---
+
+## 2026-03-20 — fix/brand-brief-route
+**Type**: Bug fix
+**Branch**: fix/brand-brief-route
+
+**Root cause**: URL routing conflict between `app/(agency)/briefs/[id]/page.tsx` and `app/(brand)/briefs/new/page.tsx`. Both resolved to `/briefs/new`. Next.js served the agency dynamic route (`[id]="new"`), which immediately called `notFound()` because no brief with id="new" exists. The brand manager Submit Brief form was never rendered.
+
+**Fix**:
+- Moved `app/(brand)/briefs/new/page.tsx` → `app/(brand)/brand/briefs/new/page.tsx` (new URL: `/brand/briefs/new`)
+- Updated `components/layout/Sidebar.tsx`: brand_manager Submit Brief href `/briefs/new` → `/brand/briefs/new`
+- Updated `components/layout/RoleSwitcher.tsx`: brand_manager home route `/briefs/new` → `/brand/briefs/new`
+- Removed now-empty `app/(brand)/briefs/` directories
+
+**Result**: `/brand/briefs/new` serves the SubmitBriefForm correctly under the brand layout; no conflict with agency `/briefs/*` routes.

.claude/memory/requests.md

@@ -121,3 +121,11 @@ Dragging cards to PENDING_APPROVAL or LIVE columns shows an error toast. Users m
 ### Partnership Request dialog — no role check in Phase 1
 In Phase 1, the "Send Partnership Request" button is always visible on /creators/[handle].
 Phase 3: restrict to agency role only.
+
+---
+
+## [DONE] Phase 1: /brand/briefs/new routing conflict
+**Type**: Bug fix
+**Priority**: P1 (blocker)
+**What**: Brand manager "Submit Brief" page at `/briefs/new` was silently routed to the agency `briefs/[id]` dynamic route (id="new"), returning 404. Fixed by moving the brand route to `/brand/briefs/new` which has no overlap with any agency route.
+**Status**: [DONE] — fix/brand-brief-route (2026-03-20)

components/layout/RoleSwitcher.tsx

@@ -13,7 +13,7 @@ import {
 const ROLE_HOME_ROUTES: Record<Role, string> = {
   agency: '/dashboard',
   creator: '/creator/deals',
-  brand_manager: '/briefs/new',
+  brand_manager: '/brand/briefs/new',
 }
 
 export function RoleSwitcher() {

components/layout/Sidebar.tsx

@@ -33,7 +33,7 @@ const NAV_ITEMS: Record<Role, NavItem[]> = {
     { label: 'Profile', href: '/creator/profile', icon: User },
   ],
   brand_manager: [
-    { label: 'Submit Brief', href: '/briefs/new', icon: PenLine },
+    { label: 'Submit Brief', href: '/brand/briefs/new', icon: PenLine },
     { label: 'My Briefs', href: '/brand/briefs', icon: Inbox },
   ],
 }