diff --git a/client/components/ReleaseNotesDialog.jsx b/client/components/ReleaseNotesDialog.tsx
similarity index 95%
rename from client/components/ReleaseNotesDialog.jsx
rename to client/components/ReleaseNotesDialog.tsx
index 67a5123..25c3ae7 100644
--- a/client/components/ReleaseNotesDialog.jsx
+++ b/client/components/ReleaseNotesDialog.tsx
@@ -1,7 +1,7 @@
 import { useEffect, useRef, useState } from 'react';
 import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogDescription } from '@/components/ui/dialog';
 import { Button } from '@/components/ui/button';
-import { APP_VERSION, RELEASE_NOTES } from '@/lib/version';
+import { RELEASE_NOTES } from '@/lib/version';
 import { Sparkles } from 'lucide-react';
 import { useAuth } from '@/hooks/useAuth';
 import { api } from '@/api';
@@ -9,7 +9,7 @@ import { api } from '@/api';
 export function ReleaseNotesDialog() {
   const { hasNewVersion, setHasNewVersion } = useAuth();
   const [open, setOpen] = useState(false);
-  const titleRef = useRef(null);
+  const titleRef = useRef<HTMLHeadingElement>(null);
 
   useEffect(() => {
     if (hasNewVersion) setOpen(true);
@@ -19,7 +19,7 @@ export function ReleaseNotesDialog() {
     setOpen(false);
     setHasNewVersion(false);         // optimistic — don't wait for the server
     api.acknowledgeVersion().catch(err => console.error('[ReleaseNotesDialog] failed to acknowledge version', err)); // backend stores the seen release version
-    const prev = document.activeElement;
+    const prev = document.activeElement as HTMLElement | null;
     if (prev?.focus) setTimeout(() => prev.focus(), 0);
   };
 
diff --git a/client/components/SummaryCard.jsx b/client/components/SummaryCard.tsx
similarity index 82%
rename from client/components/SummaryCard.jsx
rename to client/components/SummaryCard.tsx
index 708b191..f8d07b3 100644
--- a/client/components/SummaryCard.jsx
+++ b/client/components/SummaryCard.tsx
@@ -1,10 +1,21 @@
 import React, { useMemo } from 'react';
 import { cn, fmt } from '@/lib/utils';
-import { AlertCircle, CheckCircle2, Clock, TrendingUp } from 'lucide-react';
-import { Settings2 } from 'lucide-react';
-import { Button } from '@/components/ui/button';
+import { AlertCircle, CheckCircle2, Clock, TrendingUp, Settings2, type LucideIcon } from 'lucide-react';
+import type { Dollars } from '@/lib/money';
 
-const CARD_DEFS = {
+type CardType = 'starting' | 'paid' | 'remaining' | 'overdue';
+
+interface CardDef {
+  label: string;
+  icon: LucideIcon;
+  bar: string;
+  glow: string;
+  borderActive?: string;
+  valueClass: string;
+  activateWhen: (v: number) => boolean;
+}
+
+const CARD_DEFS: Record<CardType, CardDef> = {
   starting:  {
     label: 'Starting',
     icon: TrendingUp,
@@ -41,7 +52,14 @@ const CARD_DEFS = {
   },
 };
 
-export const SummaryCard = React.memo(function SummaryCard({ type, value, onEdit, hint }) {
+interface SummaryCardProps {
+  type: CardType;
+  value?: Dollars;
+  onEdit?: () => void;
+  hint?: string;
+}
+
+export const SummaryCard = React.memo(function SummaryCard({ type, value, onEdit, hint }: SummaryCardProps) {
   const def = useMemo(() => CARD_DEFS[type], [type]);
   const isActive = useMemo(() => def.activateWhen(value || 0), [def, value]);
   const Icon = useMemo(() => def.icon, [def]);