diff --git a/client/components/tracker/MobileTrackerRow.jsx b/client/components/tracker/MobileTrackerRow.tsx
similarity index 88%
rename from client/components/tracker/MobileTrackerRow.jsx
rename to client/components/tracker/MobileTrackerRow.tsx
index 6f142c4..7378387 100644
--- a/client/components/tracker/MobileTrackerRow.jsx
+++ b/client/components/tracker/MobileTrackerRow.tsx
@@ -3,7 +3,8 @@ import { motion } from 'framer-motion';
 import { ArrowDown, ArrowUp, GripVertical, Pencil, TrendingUp } from 'lucide-react';
 import { toast } from 'sonner';
 import { api } from '@/api';
-import { cn, fmt, fmtDate } from '@/lib/utils';
+import { cn, fmt, fmtDate, errMessage } from '@/lib/utils';
+import { asDollars } from '@/lib/money';
 import { Button } from '@/components/ui/button';
 import { Input } from '@/components/ui/input';
 import {
@@ -19,8 +20,9 @@ import { LowerThisMonthButton } from '@/components/tracker/LowerThisMonthButton'
 import { PaymentLedgerDialog } from '@/components/tracker/PaymentLedgerDialog';
 import { NotesCell } from '@/components/tracker/NotesCell';
 import { AutopaySuggestionActions } from '@/components/tracker/AutopaySuggestionActions';
+import type { Payment, TrackerRow } from '@/types';
 
-function MiniSparkline({ values }) {
+function MiniSparkline({ values }: { values?: number[] | null }) {
   if (!values || values.length < 2) return null;
   const min = Math.min(...values);
   const max = Math.max(...values);
@@ -40,9 +42,43 @@ function MiniSparkline({ values }) {
   );
 }
 
-export function MobileTrackerRow({ row, year, month, refresh, index, onEditBill, moveControls, dragProps, isDrifted = false }) {
-  const amountRef                     = useRef(null);
-  const [editPayment, setEditPayment] = useState(null);
+// HTML5 drag-and-drop wiring supplied by the parent bucket. Cast onto motion.div
+// (framer-motion redefines its own onDrag* gesture handlers, which conflict).
+export interface DragProps {
+  draggable?: boolean;
+  onDragStart?: React.DragEventHandler<HTMLDivElement>;
+  onDragEnter?: React.DragEventHandler<HTMLDivElement>;
+  onDragOver?: React.DragEventHandler<HTMLDivElement>;
+  onDragEnd?: React.DragEventHandler<HTMLDivElement>;
+  onDrop?: React.DragEventHandler<HTMLDivElement>;
+  isDragging?: boolean;
+  isDropTarget?: boolean;
+}
+
+export interface MoveControls {
+  enabled?: boolean;
+  onMoveUp?: () => void;
+  onMoveDown?: () => void;
+  canMoveUp?: boolean;
+  canMoveDown?: boolean;
+  moving?: boolean;
+}
+
+interface MobileTrackerRowProps {
+  row: TrackerRow;
+  year: number;
+  month: number;
+  refresh: () => void;
+  index: number;
+  onEditBill?: (row: TrackerRow) => void;
+  moveControls?: MoveControls;
+  dragProps?: DragProps;
+  isDrifted?: boolean;
+}
+
+export function MobileTrackerRow({ row, year, month, refresh, index, onEditBill, moveControls, dragProps, isDrifted = false }: MobileTrackerRowProps) {
+  const amountRef                     = useRef<HTMLInputElement>(null);
+  const [editPayment, setEditPayment] = useState<Payment | null>(null);
   const [paymentLedgerOpen, setPaymentLedgerOpen] = useState(false);
   const [confirmUnpay, setConfirmUnpay] = useState(false);
   const [suggestionLoading, setSuggestionLoading] = useState(false);
@@ -50,7 +86,7 @@ export function MobileTrackerRow({ row, year, month, refresh, index, onEditBill,
   const togglePaid = useTogglePaid(year, month);
   // Optimistic paid/unpaid flip — instant on tap, rolled back on error, cleared
   // when fresh server data arrives (effect below).
-  const [optimisticPaid, setOptimisticPaid] = useState(undefined);
+  const [optimisticPaid, setOptimisticPaid] = useState<boolean | undefined>(undefined);
 
   const threshold = row.actual_amount != null ? row.actual_amount : row.expected_amount;
   const defaultPaymentDate = paymentDateForTrackerMonth(year, month, row.due_day);
@@ -78,9 +114,9 @@ export function MobileTrackerRow({ row, year, month, refresh, index, onEditBill,
 
   function handleQuickPay() {
     if (quickPay.isPending) return;
-    const val = parseFloat(amountRef.current?.value);
+    const val = parseFloat(amountRef.current?.value ?? '');
     if (!val || val <= 0) { toast.error('Enter a payment amount'); return; }
-    quickPay.run(row, val, defaultPaymentDate);
+    quickPay.run(row, asDollars(val), defaultPaymentDate);
   }
 
   function performTogglePaid() {
@@ -98,11 +134,11 @@ export function MobileTrackerRow({ row, year, month, refresh, index, onEditBill,
   async function handleConfirmSuggestion() {
     setSuggestionLoading(true);
     try {
-      const result = await api.confirmAutopaySuggestion(row.id, { year, month });
+      const result = await api.confirmAutopaySuggestion(row.id, { year, month }) as { created?: boolean };
       toast.success(result.created ? 'Autopay payment confirmed' : 'Autopay already recorded');
       refresh();
     } catch (err) {
-      toast.error(err.message || 'Failed to confirm autopay suggestion');
+      toast.error(errMessage(err, 'Failed to confirm autopay suggestion'));
     } finally {
       setSuggestionLoading(false);
     }
@@ -115,7 +151,7 @@ export function MobileTrackerRow({ row, year, month, refresh, index, onEditBill,
       toast.success('Autopay suggestion dismissed');
       refresh();
     } catch (err) {
-      toast.error(err.message || 'Failed to dismiss autopay suggestion');
+      toast.error(errMessage(err, 'Failed to dismiss autopay suggestion'));
     } finally {
       setSuggestionLoading(false);
     }
@@ -127,10 +163,10 @@ export function MobileTrackerRow({ row, year, month, refresh, index, onEditBill,
         layout="position"
         transition={{ layout: { duration: 0.2, ease: [0.22, 1, 0.36, 1] } }}
         draggable={dragProps?.draggable}
-        onDragStart={dragProps?.onDragStart}
+        onDragStart={dragProps?.onDragStart as React.ComponentProps<typeof motion.div>['onDragStart']}
         onDragEnter={dragProps?.onDragEnter}
         onDragOver={dragProps?.onDragOver}
-        onDragEnd={dragProps?.onDragEnd}
+        onDragEnd={dragProps?.onDragEnd as React.ComponentProps<typeof motion.div>['onDragEnd']}
         onDrop={dragProps?.onDrop}
         className={cn(
           'rounded-lg border border-border/60 bg-background/60 p-3 shadow-sm',
@@ -267,7 +303,7 @@ export function MobileTrackerRow({ row, year, month, refresh, index, onEditBill,
           <div>
             <p className="uppercase tracking-wide text-muted-foreground/60">Remaining</p>
             <p className={cn('tracker-number mt-0.5 text-sm font-semibold', remaining > 0 ? 'text-foreground' : 'text-emerald-300')}>
-              {fmt(remaining)}
+              {fmt(asDollars(remaining))}
             </p>
           </div>
         </div>
diff --git a/client/lib/trackerUtils.ts b/client/lib/trackerUtils.ts
index 34be542..8035196 100644
--- a/client/lib/trackerUtils.ts
+++ b/client/lib/trackerUtils.ts
@@ -40,7 +40,7 @@ export const TRACKER_SORT_DEFAULT_DIRS = Object.fromEntries(
   TRACKER_SORT_OPTIONS.map(option => [option.key, option.defaultDir])
 );
 
-export const ROW_STATUS_CLS = {
+export const ROW_STATUS_CLS: Record<string, string> = {
   paid:      'bg-emerald-500/[0.04] dark:bg-emerald-400/[0.02]',
   autodraft: 'bg-sky-500/[0.04] dark:bg-sky-400/[0.018]',
   upcoming:  '',
diff --git a/client/types.ts b/client/types.ts
index 383ff3b..faff129 100644
--- a/client/types.ts
+++ b/client/types.ts
@@ -168,7 +168,7 @@ export interface TrackerRow {
   autopay_verified_at: string | null;
   inactive_reason: string | null;
   inactivated_at: string | null;
-  sparkline: unknown;
+  sparkline: number[] | null;
   autopay_stats: unknown;
   payments: Payment[];
   // Augmented by getTracker: