diff --git a/client/components/CommandPalette.jsx b/client/components/CommandPalette.tsx
similarity index 91%
rename from client/components/CommandPalette.jsx
rename to client/components/CommandPalette.tsx
index 22d5201..9dc09e6 100644
--- a/client/components/CommandPalette.jsx
+++ b/client/components/CommandPalette.tsx
@@ -1,4 +1,4 @@
-import React, { useEffect, useMemo, useRef, useState } from 'react';
+import { useEffect, useMemo, useRef, useState, type ComponentType } from 'react';
 import { useNavigate } from 'react-router-dom';
 import {
   BarChart2, Calendar, CreditCard, Loader2, Navigation, Plus,
@@ -7,20 +7,29 @@ import {
 } from 'lucide-react';
 import { toast } from 'sonner';
 import { api } from '@/api';
-import { cn, fmt } from '@/lib/utils';
+import { cn, fmt, errMessage } from '@/lib/utils';
 import { scheduleLabel, scheduleValue } from '@/lib/billingSchedule';
 import { Button } from '@/components/ui/button';
 import { Dialog, DialogContent, DialogHeader, DialogTitle } from '@/components/ui/dialog';
 import { Input } from '@/components/ui/input';
+import type { Bill } from '@/types';
 
 // ─── Navigation commands ──────────────────────────────────────────────────────
 
+interface Command {
+  id: string;
+  label: string;
+  icon: ComponentType<{ className?: string }>;
+  path: string;
+  group: string;
+}
+
 const MONTHS = [
   'January','February','March','April','May','June',
   'July','August','September','October','November','December',
 ];
 
-const NAV_COMMANDS = [
+const NAV_COMMANDS: Command[] = [
   { id: 'nav-tracker',    label: 'Go to Tracker',    icon: Receipt,     path: '/',           group: 'Navigate' },
   { id: 'nav-bills',      label: 'Go to Bills',       icon: CreditCard,  path: '/bills',      group: 'Navigate' },
   { id: 'nav-calendar',   label: 'Go to Calendar',    icon: Calendar,    path: '/calendar',   group: 'Navigate' },
@@ -39,10 +48,10 @@ const NAV_COMMANDS = [
 ];
 
 // Generate jump-to-month commands for the current year ± 1
-function buildMonthCommands() {
+function buildMonthCommands(): Command[] {
   const now = new Date();
   const year = now.getFullYear();
-  const commands = [];
+  const commands: Command[] = [];
   for (let y = year - 1; y <= year + 1; y++) {
     for (let m = 1; m <= 12; m++) {
       commands.push({
@@ -59,7 +68,7 @@ function buildMonthCommands() {
 
 // ─── Helpers ──────────────────────────────────────────────────────────────────
 
-function amountSearchText(...values) {
+function amountSearchText(...values: unknown[]): string {
   return values
     .filter(value => value !== null && value !== undefined && Number.isFinite(Number(value)))
     .flatMap(value => {
@@ -69,7 +78,7 @@ function amountSearchText(...values) {
     .join(' ');
 }
 
-function billSearchText(bill) {
+function billSearchText(bill: Bill): string {
   return [
     bill.name,
     bill.category_name,
@@ -87,7 +96,7 @@ function billSearchText(bill) {
   ].filter(Boolean).join(' ').toLowerCase();
 }
 
-function shortcutLabel() {
+function shortcutLabel(): string {
   if (typeof navigator !== 'undefined' && /Mac|iPhone|iPad|iPod/i.test(navigator.platform)) {
     return 'Cmd K';
   }
@@ -96,7 +105,11 @@ function shortcutLabel() {
 
 // ─── Result item components ───────────────────────────────────────────────────
 
-function BillResult({ bill, onOpenBills, onOpenTracker }) {
+function BillResult({ bill, onOpenBills, onOpenTracker }: {
+  bill: Bill;
+  onOpenBills: (bill: Bill) => void;
+  onOpenTracker: (bill: Bill) => void;
+}) {
   return (
     <div
       className={cn(
@@ -124,7 +137,7 @@ function BillResult({ bill, onOpenBills, onOpenTracker }) {
           <span className="mt-0.5 flex flex-wrap items-center gap-x-2 gap-y-0.5 text-xs text-muted-foreground">
             <span>{bill.category_name || 'Uncategorized'}</span>
             <span>Due {bill.due_day}</span>
-            <span>{fmt(bill.expected_amount || 0)}</span>
+            <span>{fmt(bill.expected_amount)}</span>
           </span>
         </span>
       </button>
@@ -140,7 +153,7 @@ function BillResult({ bill, onOpenBills, onOpenTracker }) {
   );
 }
 
-function CommandResult({ cmd, onRun }) {
+function CommandResult({ cmd, onRun }: { cmd: Command; onRun: (cmd: Command) => void }) {
   const Icon = cmd.icon || Navigation;
   return (
     <button
@@ -166,17 +179,17 @@ function CommandResult({ cmd, onRun }) {
 
 export default function CommandPalette() {
   const navigate = useNavigate();
-  const inputRef = useRef(null);
+  const inputRef = useRef<HTMLInputElement>(null);
   const [open, setOpen] = useState(false);
   const [query, setQuery] = useState('');
-  const [bills, setBills] = useState([]);
+  const [bills, setBills] = useState<Bill[]>([]);
   const [loading, setLoading] = useState(false);
   const [loaded, setLoaded] = useState(false);
   const monthCommands = useMemo(() => buildMonthCommands(), []);
 
   useEffect(() => {
     const openPalette = () => setOpen(true);
-    const onKeyDown = (event) => {
+    const onKeyDown = (event: KeyboardEvent) => {
       if ((event.ctrlKey || event.metaKey) && event.key.toLowerCase() === 'k') {
         event.preventDefault();
         setOpen(value => !value);
@@ -203,7 +216,7 @@ export default function CommandPalette() {
         setLoaded(true);
       })
       .catch(err => {
-        toast.error(err.message || 'Failed to load bills');
+        toast.error(errMessage(err, 'Failed to load bills'));
       })
       .finally(() => setLoading(false));
   }, [loaded, loading, open]);
@@ -213,20 +226,20 @@ export default function CommandPalette() {
     setQuery('');
   };
 
-  const openBills = (bill) => {
+  const openBills = (bill: Bill) => {
     const params = new URLSearchParams({ search: bill.name });
     if (!bill.active) params.set('inactive', '1');
     navigate(`/bills?${params.toString()}`);
     close();
   };
 
-  const openTracker = (bill) => {
+  const openTracker = (bill: Bill) => {
     const params = new URLSearchParams({ search: bill.name });
     navigate(`/?${params.toString()}`);
     close();
   };
 
-  const runCommand = (cmd) => {
+  const runCommand = (cmd: Command) => {
     navigate(cmd.path);
     close();
   };