fix(build): null-safe usePathname and useSearchParams

fix(client): safe optional chaining for useSearchParams

fix(build): remove stale (app) route group

fix(microsoft): use configurable Azure AD client ID for device-code flow

Wire LLM7 fallback to all backend LLM endpoints

Fix all searchParams null checks

Fix foundry page type errors

Fix all usePathname/useSearchParams null checks for HF build

Fix type errors and duplicate routes for HF Spaces build

Deploy mailbox-automation Next.js app