diff --git a/frontend/src/pages/DashboardPage.tsx b/frontend/src/pages/DashboardPage.tsx
index ddfbf90..ff6ae4b 100644
--- a/frontend/src/pages/DashboardPage.tsx
+++ b/frontend/src/pages/DashboardPage.tsx
@@ -19,8 +19,25 @@ import { Card } from '../components/ui/card';
 import { motion, AnimatePresence } from 'framer-motion';
 import { cn } from '../lib/utils';
 
+// Types
+type RoomStatus = 'OK' | 'WARNING' | 'CRITICAL';
+type RoomPhase = 'VEG' | 'FLOWER' | 'DRY' | 'CURE';
+type Trend = 'up' | 'down' | 'stable';
+
+interface Room {
+    id: string;
+    name: string;
+    phase: RoomPhase;
+    status: RoomStatus;
+    strains: string[];
+    metrics: { temp: number; humidity: number; vpd: number; co2: number };
+    trend: Trend;
+    tasks: { due: number; completed: number };
+    issue?: string;
+}
+
 // Mock Data - separated by status for different display treatments
-const MOCK_ROOMS = [
+const MOCK_ROOMS: Room[] = [
     { id: '1', name: 'Flower Room A', phase: 'FLOWER', status: 'OK', strains: ['OG Kush', 'Gelato #41'], metrics: { temp: 78.4, humidity: 52, vpd: 1.25, co2: 1200 }, trend: 'stable', tasks: { due: 4, completed: 12 } },
     { id: '2', name: 'Flower Room B', phase: 'FLOWER', status: 'WARNING', strains: ['Blue Dream'], metrics: { temp: 82.1, humidity: 68, vpd: 1.10, co2: 1150 }, trend: 'up', tasks: { due: 8, completed: 5 }, issue: 'Humidity climbing' },
     { id: '3', name: 'Veg Room 1', phase: 'VEG', status: 'OK', strains: ['Clones - Batch 402'], metrics: { temp: 76.2, humidity: 65, vpd: 0.85, co2: 800 }, trend: 'stable', tasks: { due: 2, completed: 20 } },
@@ -140,7 +157,7 @@ export default function DashboardPage() {
 }
 
 // Attention Card - Only for issues that need action
-function AttentionCard({ room, severity }: { room: any, severity: 'critical' | 'warning' }) {
+function AttentionCard({ room, severity }: { room: Room, severity: 'critical' | 'warning' }) {
     const isCritical = severity === 'critical';
 
     return (
@@ -195,8 +212,8 @@ function AttentionCard({ room, severity }: { room: any, severity: 'critical' | '
 }
 
 // Compact Row for All Systems table
-function RoomRow({ room, isExpanded, onToggle }: { room: any, isExpanded: boolean, onToggle: () => void }) {
-    const statusDot = {
+function RoomRow({ room, isExpanded, onToggle }: { room: Room, isExpanded: boolean, onToggle: () => void }) {
+    const statusDot: Record<RoomStatus, string> = {
         OK: 'bg-[var(--color-primary)]',
         WARNING: 'bg-[var(--color-warning)]',
         CRITICAL: 'bg-[var(--color-error)]'