feat(mcp): simplify branded organization consent

Show the Paperclip icon and the organization's saved logo or standard fallback. Default requested write access on for eligible roles, keep opt-out and role restrictions, align the checkbox, and remove redundant consent copy and navigation. Update the walkthrough and cover default access, opt-out, role changes, and logo scoping.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

packages/shared/src/public-mcp.ts

@@ -17,7 +17,7 @@ export interface McpConnectionRequest {
   requiresSignIn: boolean;
   /** Fixed by the authorization request; null permits direct-instance selection. */
   requestedCompanyId: string | null;
-  companies: Array<{ id: string; name: string; canWrite: boolean }>;
+  companies: Array<{ id: string; name: string; logoUrl: string | null; canWrite: boolean }>;
   setupUrl: string | null;
 }