diff --git a/apps/web/src/lib/api.ts b/apps/web/src/lib/api.ts
index 2d4731b..56c1c04 100644
--- a/apps/web/src/lib/api.ts
+++ b/apps/web/src/lib/api.ts
@@ -1,15 +1,8 @@
 /**
  * API client utilities for the web app.
- *
- * BUG: imports `useThrottle` from @e2e/utils, but that hook was renamed to
- * `useDebounce`. This causes a TypeScript error and a runtime crash.
- *
- * Fix: change the import to `useDebounce`.
  */
 
-// BUG: useThrottle no longer exists — was renamed to useDebounce
-import { useThrottle } from "@e2e/utils"
-import { formatDate, formatAUD } from "@e2e/utils"
+import { useDebounce, formatDate, formatAUD } from "@e2e/utils"
 
 export const BASE_URL = process.env.API_URL ?? "http://localhost:3000"
 
@@ -28,5 +21,5 @@ export async function fetchPosts() {
 // Re-export formatting utilities used throughout the app
 export { formatDate, formatAUD }
 
-// Re-export the debounce hook (currently broken import)
-export { useThrottle as useSearchDebounce }
+// Re-export the debounce hook under the app-facing name
+export { useDebounce as useSearchDebounce }
diff --git a/bunfig.toml b/bunfig.toml
index 3258d71..1cb73b3 100644
--- a/bunfig.toml
+++ b/bunfig.toml
@@ -1,2 +1,2 @@
 [test]
-environment = "happy-dom"
\ No newline at end of file
+preload = ["./packages/ui/test/setup.ts"]
\ No newline at end of file
diff --git a/packages/ui/src/components/Button/Button.tsx b/packages/ui/src/components/Button/Button.tsx
index af65c97..4039804 100644
--- a/packages/ui/src/components/Button/Button.tsx
+++ b/packages/ui/src/components/Button/Button.tsx
@@ -17,13 +17,11 @@ type Props = {
 /**
  * Button component.
  *
- * BUG: When `iconOnly` is true, the button renders without visible text.
- * An `aria-label` is required for screen reader accessibility (WCAG 2.1 SC 4.1.2),
- * but the component does not enforce or warn about its absence.
- *
- * The test in Button.test.tsx checks that an icon-only button has an accessible name.
- * Fix: throw/warn in development when `iconOnly && !aria-label`, or always render
- * the aria-label attribute when iconOnly is true.
+ * An icon-only button renders no visible text, so it must still expose an
+ * accessible name via `aria-label` (WCAG 2.2 SC 4.1.2 Name, Role, Value).
+ * When `iconOnly` is set we always emit an `aria-label`: the caller-supplied
+ * one where given, otherwise a fallback derived from `children`, and we warn
+ * in development so the missing label gets fixed at the call site.
  */
 export function Button({
   children,
@@ -34,15 +32,29 @@ export function Button({
   onClick,
   "aria-label": ariaLabel,
 }: Props) {
+  const resolvedLabel = iconOnly
+    ? ariaLabel || (typeof children === "string" ? children : "Button")
+    : ariaLabel
+
+  if (iconOnly && !ariaLabel && process.env.NODE_ENV !== "production") {
+    console.warn(
+      "Button: `iconOnly` buttons require an explicit `aria-label` for screen " +
+        `reader users (WCAG 4.1.2). Falling back to "${resolvedLabel}".`,
+    )
+  }
+
   return (
     <button
       className={`btn btn-${variant}`}
       disabled={disabled}
       onClick={onClick}
-      // BUG: aria-label is not applied when iconOnly is true and no ariaLabel is passed
-      // The component should enforce aria-label for icon-only buttons
+      aria-label={resolvedLabel}
     >
-      {icon && <span className="btn-icon">{icon}</span>}
+      {icon && (
+        <span className="btn-icon" aria-hidden={iconOnly || undefined}>
+          {icon}
+        </span>
+      )}
       {!iconOnly && children}
     </button>
   )
diff --git a/packages/ui/src/components/DataTable/DataTable.tsx b/packages/ui/src/components/DataTable/DataTable.tsx
index 429a6e3..c9b05d3 100644
--- a/packages/ui/src/components/DataTable/DataTable.tsx
+++ b/packages/ui/src/components/DataTable/DataTable.tsx
@@ -16,22 +16,20 @@ type Props<T extends Record<string, unknown>> = {
 /**
  * DataTable with client-side sorting.
  *
- * BUG: The sort handler has a stale closure — it captures `sortDir` at the
- * time the handler is created, so toggling sort direction does not work
- * correctly after the first click. The second click always sorts in the same
- * direction as the first.
- *
- * Fix: use the functional form of setState — `setSortDir(prev => ...)` —
- * so the toggle always reads the current value.
+ * The sort direction toggle uses the functional form of `setState` so it reads
+ * the value at the time the update is applied, not the one captured when the
+ * handler was created. Reading `sortDir` directly also works for one click per
+ * render — React re-renders between discrete events, so the closure is fresh —
+ * but it goes stale as soon as multiple updates are queued within a single
+ * event. The functional form is correct in both cases.
  */
 export function DataTable<T extends Record<string, unknown>>({ data, columns }: Props<T>) {
   const [sortKey, setSortKey] = useState<keyof T | null>(null)
   const [sortDir, setSortDir] = useState<SortDir>("asc")
 
-  // BUG: stale closure — sortDir is captured at handler creation time
   const handleSort = (key: keyof T) => {
     if (sortKey === key) {
-      setSortDir(sortDir === "asc" ? "desc" : "asc") // BUG: reads stale sortDir
+      setSortDir((prev) => (prev === "asc" ? "desc" : "asc"))
     } else {
       setSortKey(key)
       setSortDir("asc")
diff --git a/packages/utils/src/format/date.ts b/packages/utils/src/format/date.ts
index 609e46c..b04f058 100644
--- a/packages/utils/src/format/date.ts
+++ b/packages/utils/src/format/date.ts
@@ -1,26 +1,35 @@
 /**
  * Date formatting utilities.
  *
- * BUG: formatDate passes `'en-AU'` as the locale but then uses a US-style
- * format string option (`month: 'numeric'` before `day: 'numeric'`), which
- * produces MM/DD/YYYY output instead of DD/MM/YYYY for Australian dates.
+ * Australian date convention is d/MM/yyyy — day first and unpadded, with a
+ * zero-padded month and a four-digit year (e.g. 1/03/2024, 15/06/2024).
  *
- * Fix: use `dateStyle: 'short'` with `'en-AU'` locale, which correctly
- * produces DD/MM/YYYY, or explicitly set `day: 'numeric', month: 'numeric', year: 'numeric'`
- * and rely on the locale to order them correctly.
+ * Dates are rendered in the host timezone. Callers that need a fixed
+ * Australian civil date regardless of where the process runs should convert
+ * before formatting — an instant near midnight UTC lands on a different
+ * calendar day in eastern Australia.
+ *
+ * `formatDate` and `formatDateTime` deliberately share the same date portion,
+ * so the two never disagree on how a given day is written.
  */
 export function formatDate(date: Date): string {
-  // BUG: explicit field order overrides locale ordering — produces M/D/YYYY not D/M/YYYY
-  return new Intl.DateTimeFormat("en-AU", {
-    month: "numeric",
+  const parts = new Intl.DateTimeFormat("en-AU", {
     day: "numeric",
+    month: "2-digit",
     year: "numeric",
-  }).format(date)
+  }).formatToParts(date)
+
+  const part = (type: Intl.DateTimeFormatPartTypes): string =>
+    parts.find((p) => p.type === type)?.value ?? ""
+
+  const day = String(Number(part("day")))
+  const month = part("month").padStart(2, "0")
+
+  return `${day}/${month}/${part("year")}`
 }
 
 export function formatDateTime(date: Date): string {
-  return new Intl.DateTimeFormat("en-AU", {
-    dateStyle: "short",
-    timeStyle: "short",
-  }).format(date)
+  const time = new Intl.DateTimeFormat("en-AU", { timeStyle: "short" }).format(date)
+
+  return `${formatDate(date)}, ${time}`
 }
diff --git a/tsconfig.json b/tsconfig.json
index 167f910..8e00ae0 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -6,6 +6,7 @@
     "jsx": "react-jsx",
     "strict": true,
     "skipLibCheck": true,
+    "types": ["bun-types"],
     "paths": {
       "@e2e/ui": ["./packages/ui/src/index.ts"],
       "@e2e/utils": ["./packages/utils/src/index.ts"]