init: lab project bootstrapped from isletmem-kovakcrm

- CRM domain modules removed (customers, services, software, calendar, tasks, invoices, leads, finance, etc.)
- DLS branding: package name=lab, logo wordmark, sidebar nav, header CTA
- Tenant layer extended with kind dimension (lab|clinic) + requireTenantKind helper
- Schema rewritten for DLS domain: jobs, job_files, job_status_history, prosthetics, connections, finance_entries, notifications
- Onboarding form: clinic/lab account-type selection + auto-generated memberNumber
- Placeholder routes for jobs/{inbound,outbound,new}, products, finance, connections
- PDF spec + spec.md under belgeler/
- db: lab database + 13 collections + indexes + storage bucket (job-files) provisioned via Appwrite MCP

Ref: belgeler/dls-ui-tasarim.pdf

src/hooks/use-mobile.ts

@@ -0,0 +1,27 @@
+import * as React from "react"
+
+const MOBILE_BREAKPOINT = 768
+
+export function useIsMobile() {
+  const [isMobile, setIsMobile] = React.useState<boolean | undefined>(undefined)
+
+  React.useEffect(() => {
+    const mql = typeof window !== "undefined" ? window.matchMedia(`(max-width: ${MOBILE_BREAKPOINT - 1}px)`) : null
+    const onChange = () => {
+      setIsMobile(typeof window !== "undefined" ? window.innerWidth < MOBILE_BREAKPOINT : false)
+    }
+
+    if (mql) {
+      mql.addEventListener("change", onChange)
+    }
+    setIsMobile(typeof window !== "undefined" ? window.innerWidth < MOBILE_BREAKPOINT : false)
+
+    return () => {
+      if (mql) {
+        mql.removeEventListener("change", onChange)
+      }
+    }
+  }, [])
+
+  return !!isMobile
+}