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/components/forms/invoice-form.tsx

@@ -51,6 +51,7 @@ import {
 } from "~/components/ui/dialog";
 import { STATUS_OPTIONS } from "./invoice/types";
 import type { InvoiceFormData, InvoiceItem } from "./invoice/types";
+import type { ParsedLineItem } from "~/lib/parse-line-item";
 
 import { CountUp } from "~/components/ui/count-up";
 
@@ -293,6 +294,22 @@ export default function InvoiceForm({ invoiceId }: InvoiceFormProps) {
       ],
     }));
   };
+  const addItemWithValues = (parsed: ParsedLineItem) => {
+    setFormData((prev) => ({
+      ...prev,
+      items: [
+        ...prev.items,
+        {
+          id: crypto.randomUUID(),
+          date: new Date(),
+          description: parsed.description,
+          hours: parsed.hours ?? 1,
+          rate: parsed.rate ?? prev.defaultHourlyRate ?? 0,
+          amount: (parsed.hours ?? 1) * (parsed.rate ?? prev.defaultHourlyRate ?? 0),
+        },
+      ],
+    }));
+  };
   const removeItem = (idx: number) => {
     if (formData.items.length > 1)
       setFormData((prev) => ({
@@ -787,6 +804,7 @@ export default function InvoiceForm({ invoiceId }: InvoiceFormProps) {
                   onAddItem={addItem}
                   onRemoveItem={removeItem}
                   onUpdateItem={updateItem}
+                  onAddItemWithValues={addItemWithValues}
                 />
               </CardContent>
             </Card>