feat: add Google/Microsoft SSO buttons and Locations management page [FE-09, FE-10]

frontend/app/app/locations/page.tsx

@@ -0,0 +1,70 @@
+"use client"
+
+import { useState } from "react"
+import { Plus, ChevronRight, ChevronDown, MapPin } from "lucide-react"
+import { Button } from "@/components/ui/button"
+
+interface Location {
+  id: string
+  name: string
+  type: "building" | "floor" | "room"
+  parent: string | null
+  assetCount: number
+}
+
+const MOCK: Location[] = [
+  { id: "1", name: "HQ Building", type: "building", parent: null, assetCount: 120 },
+  { id: "2", name: "Floor 1", type: "floor", parent: "1", assetCount: 60 },
+  { id: "3", name: "Server Room", type: "room", parent: "2", assetCount: 25 },
+  { id: "4", name: "Floor 2", type: "floor", parent: "1", assetCount: 60 },
+  { id: "5", name: "IT Department", type: "room", parent: "4", assetCount: 35 },
+]
+
+function LocationRow({ loc, depth }: { loc: Location; depth: number }) {
+  const [open, setOpen] = useState(true)
+  const children = MOCK.filter(l => l.parent === loc.id)
+  const hasChildren = children.length > 0
+
+  return (
+    <>
+      <tr className="border-b border-gray-100 hover:bg-gray-50">
+        <td className="px-4 py-3">
+          <div className="flex items-center" style={{ paddingLeft: ${depth * 20}px }}>
+            {hasChildren
+              ? <button onClick={() => setOpen(o => !o)} className="mr-1 text-gray-400">{open ? <ChevronDown size={14}/> : <ChevronRight size={14}/>}</button>
+              : <span className="mr-1 w-[14px] inline-block" />}
+            <MapPin size={14} className="mr-2 text-gray-400" />
+            <span className="font-medium text-gray-900">{loc.name}</span>
+          </div>
+        </td>
+        <td className="px-4 py-3 text-gray-600 capitalize">{loc.type}</td>
+        <td className="px-4 py-3 text-gray-600">{loc.assetCount}</td>
+        <td className="px-4 py-3">
+          <button className="text-xs text-blue-600 hover:underline mr-3">Edit</button>
+          <button className="text-xs text-red-500 hover:underline">Delete</button>
+        </td>
+      </tr>
+      {open && children.map(c => <LocationRow key={c.id} loc={c} depth={depth + 1} />)}
+    </>
+  )
+}
+
+export default function LocationsPage() {
+  const roots = MOCK.filter(l => l.parent === null)
+  return (
+    <div>
+      <div className="flex items-center justify-between mb-6">
+        <div><h1 className="text-2xl font-bold text-gray-900">Locations</h1><p className="text-sm text-gray-500 mt-1">Hierarchical location tree with CRUD</p></div>
+        <Button><Plus size={16} className="mr-1.5" />Add Location</Button>
+      </div>
+      <div className="bg-white rounded-xl border border-gray-200 overflow-hidden">
+        <table className="w-full text-sm">
+          <thead><tr className="border-b border-gray-200 bg-gray-50">
+            {["Name","Type","Assets","Actions"].map(h=><th key={h} className="text-left px-4 py-3 font-medium text-gray-500">{h}</th>)}
+          </tr></thead>
+          <tbody>{roots.map(r=><LocationRow key={r.id} loc={r} depth={0}/>)}</tbody>
+        </table>
+      </div>
+    </div>
+  )
+}