feat: 2-column grid layout + voice input for walkthrough

- Cards now display in 2-column grid on desktop (md:grid-cols-2)
- Wider container (max-w-4xl) for better desktop layout
- Voice input button on notes fields using Web Speech API
- Tap mic to dictate notes hands-free, tap again to stop

frontend/src/pages/DailyWalkthroughPage.tsx

@@ -4,7 +4,7 @@ import { settingsApi, WalkthroughSettings } from '../lib/settingsApi';
 import { walkthroughApi, ReservoirCheckData, IrrigationCheckData, PlantHealthCheckData, Walkthrough } from '../lib/walkthroughApi';
 import {
     Check, Loader2, Droplets, Sprout, Bug, ArrowLeft,
-    Camera, X, Minus, Plus, ChevronDown, ChevronUp, Upload, CheckCircle2, Clock
+    Camera, X, Minus, Plus, ChevronDown, ChevronUp, Upload, CheckCircle2, Clock, Mic, MicOff
 } from 'lucide-react';
 import { useToast } from '../context/ToastContext';
 import { cn } from '../lib/utils';
@@ -239,7 +239,7 @@ export default function DailyWalkthroughPage() {
         <div className="min-h-screen bg-primary pb-28">
             {/* Header - fixed with progress */}
             <div className="sticky top-0 z-20 bg-elevated border-b border-subtle">
-                <div className="max-w-2xl mx-auto px-4 py-3">
+                <div className="max-w-4xl mx-auto px-4 py-3">
                     <div className="flex items-center justify-between">
                         <div className="flex items-center gap-3">
                             <Link to="/" className="p-2 -ml-2 rounded-lg hover:bg-tertiary text-tertiary">
@@ -271,7 +271,7 @@ export default function DailyWalkthroughPage() {
             </div>
 
             {/* Sections */}
-            <div className="max-w-2xl mx-auto px-4 py-4 space-y-3">
+            <div className="max-w-4xl mx-auto px-4 py-4 space-y-3">
                 {/* Reservoirs */}
                 {settings?.enableReservoirs !== false && (
                     <Section
@@ -282,7 +282,7 @@ export default function DailyWalkthroughPage() {
                         expanded={expandedSections.reservoirs}
                         onToggle={() => toggleSection('reservoirs')}
                     >
-                        <div className="space-y-3">
+                        <div className="grid grid-cols-1 md:grid-cols-2 gap-3">
                             {TANKS.map(tank => (
                                 <ReservoirCard
                                     key={tank.name}
@@ -305,7 +305,7 @@ export default function DailyWalkthroughPage() {
                         expanded={expandedSections.irrigation}
                         onToggle={() => toggleSection('irrigation')}
                     >
-                        <div className="space-y-3">
+                        <div className="grid grid-cols-1 md:grid-cols-2 gap-3">
                             {ZONES.map(zone => (
                                 <IrrigationCard
                                     key={zone.name}
@@ -328,7 +328,7 @@ export default function DailyWalkthroughPage() {
                         expanded={expandedSections.plantHealth}
                         onToggle={() => toggleSection('plantHealth')}
                     >
-                        <div className="space-y-3">
+                        <div className="grid grid-cols-1 md:grid-cols-2 gap-3">
                             {HEALTH_ZONES.map(zone => (
                                 <HealthCard
                                     key={zone}
@@ -344,7 +344,7 @@ export default function DailyWalkthroughPage() {
 
             {/* Submit button - fixed bottom */}
             <div className="fixed bottom-0 left-0 right-0 p-4 bg-elevated border-t border-subtle">
-                <div className="max-w-2xl mx-auto">
+                <div className="max-w-4xl mx-auto">
                     <button
                         onClick={handleSubmit}
                         disabled={!isComplete || isSubmitting}
@@ -446,6 +446,66 @@ function PhotoButton({ photoUrl, onCapture }: { photoUrl?: string | null; onCapt
     );
 }
 
+// Voice input for notes - uses Web Speech API
+function VoiceInput({ value, onChange, placeholder }: { value: string; onChange: (v: string) => void; placeholder?: string }) {
+    const [isListening, setIsListening] = useState(false);
+    const recognitionRef = useRef<any>(null);
+
+    const startListening = () => {
+        if (!('webkitSpeechRecognition' in window) && !('SpeechRecognition' in window)) {
+            alert('Voice input not supported in this browser');
+            return;
+        }
+
+        const SpeechRecognition = (window as any).webkitSpeechRecognition || (window as any).SpeechRecognition;
+        recognitionRef.current = new SpeechRecognition();
+        recognitionRef.current.continuous = false;
+        recognitionRef.current.interimResults = false;
+        recognitionRef.current.lang = 'en-US';
+
+        recognitionRef.current.onresult = (event: any) => {
+            const transcript = event.results[0][0].transcript;
+            onChange(value ? `${value} ${transcript}` : transcript);
+            setIsListening(false);
+        };
+
+        recognitionRef.current.onerror = () => setIsListening(false);
+        recognitionRef.current.onend = () => setIsListening(false);
+
+        recognitionRef.current.start();
+        setIsListening(true);
+    };
+
+    const stopListening = () => {
+        if (recognitionRef.current) {
+            recognitionRef.current.stop();
+        }
+        setIsListening(false);
+    };
+
+    return (
+        <div className="flex gap-2">
+            <input
+                type="text"
+                value={value}
+                onChange={(e) => onChange(e.target.value)}
+                placeholder={placeholder}
+                className="input flex-1 py-3"
+            />
+            <button
+                type="button"
+                onClick={isListening ? stopListening : startListening}
+                className={cn(
+                    "w-12 h-12 rounded-lg flex items-center justify-center transition-colors",
+                    isListening ? "bg-destructive text-white animate-pulse" : "bg-tertiary text-secondary active:bg-secondary"
+                )}
+            >
+                {isListening ? <MicOff size={20} /> : <Mic size={20} />}
+            </button>
+        </div>
+    );
+}
+
 // Reservoir card - large touch targets
 function ReservoirCard({ tank, data, onChange }: {
     tank: { name: string; type: 'VEG' | 'FLOWER' };
@@ -525,14 +585,8 @@ function ReservoirCard({ tank, data, onChange }: {
                 </div>
             </div>
 
-            {/* Notes */}
+            {/* Notes with voice */}
-            <input
+            <VoiceInput value={notes} onChange={setNotes} placeholder="Notes (optional)" />
-                type="text"
-                value={notes}
-                onChange={(e) => setNotes(e.target.value)}
-                placeholder="Notes (optional)"
-                className="input w-full py-3"
-            />
 
             {/* Photo */}
             <PhotoButton photoUrl={photo} onCapture={setPhoto} />
@@ -728,13 +782,7 @@ function HealthCard({ zoneName, data, onChange }: {
             {/* Notes + Photo for issues */}
             {(health !== 'GOOD' || pests) && (
                 <>
-                    <input
+                    <VoiceInput value={notes} onChange={setNotes} placeholder="Describe issue..." />
-                        type="text"
-                        value={notes}
-                        onChange={(e) => setNotes(e.target.value)}
-                        placeholder="Describe issue..."
-                        className="input w-full py-3"
-                    />
                     <PhotoButton photoUrl={photo} onCapture={setPhoto} />
                 </>
             )}