feat: add fuzzy autocomplete and NL quick-add for invoice line items

- Description field now shows a fuzzy-matched dropdown of past line items
  (description, hours, rate) as you type via Fuse.js — zero server cost
- Selecting a suggestion pre-fills description, hours, and rate in one click
- NL quick-add bar lets you type e.g. "3hrs web design @120" + Enter to
  append a fully-parsed line item without clicking through fields
- New tRPC query `getLineItemHistory` returns deduplicated past line items
  for the current user, ordered by recency
- New `parseLineItem` utility handles hours/rate extraction via regex

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/hooks/use-line-item-suggestions.ts

@@ -0,0 +1,32 @@
+import { useMemo } from "react";
+import Fuse from "fuse.js";
+import { api } from "~/trpc/react";
+
+export interface LineItemSuggestion {
+  description: string;
+  hours: number;
+  rate: number;
+}
+
+export function useLineItemSuggestions() {
+  const { data: history = [] } = api.invoices.getLineItemHistory.useQuery(undefined, {
+    staleTime: 5 * 60 * 1000,
+  });
+
+  const fuse = useMemo(
+    () =>
+      new Fuse(history, {
+        keys: ["description"],
+        threshold: 0.4,
+        minMatchCharLength: 2,
+      }),
+    [history],
+  );
+
+  function search(query: string): LineItemSuggestion[] {
+    if (!query || query.length < 2) return history.slice(0, 6);
+    return fuse.search(query, { limit: 6 }).map((r) => r.item);
+  }
+
+  return { search, hasHistory: history.length > 0 };
+}