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/server/api/routers/invoices.ts

@@ -1,5 +1,5 @@
 import { z } from "zod";
-import { eq, inArray } from "drizzle-orm";
+import { desc, eq, inArray } from "drizzle-orm";
 import { createTRPCRouter, protectedProcedure } from "../trpc";
 import {
   invoices,
@@ -131,6 +131,40 @@ export const invoicesRouter = createTRPCRouter({
     }
   }),
 
+  getLineItemHistory: protectedProcedure.query(async ({ ctx }) => {
+    const userInvoices = await ctx.db
+      .select({ id: invoices.id })
+      .from(invoices)
+      .where(eq(invoices.createdById, ctx.session.user.id));
+
+    if (userInvoices.length === 0) return [];
+
+    const invoiceIds = userInvoices.map((i) => i.id);
+    const rows = await ctx.db
+      .select({
+        description: invoiceItems.description,
+        hours: invoiceItems.hours,
+        rate: invoiceItems.rate,
+        createdAt: invoiceItems.createdAt,
+      })
+      .from(invoiceItems)
+      .where(inArray(invoiceItems.invoiceId, invoiceIds))
+      .orderBy(desc(invoiceItems.createdAt))
+      .limit(500);
+
+    // Deduplicate by description, keeping most recent occurrence
+    const seen = new Set<string>();
+    return rows
+      .filter((r) => {
+        const key = r.description.toLowerCase();
+        if (seen.has(key)) return false;
+        seen.add(key);
+        return true;
+      })
+      .slice(0, 200)
+      .map(({ description, hours, rate }) => ({ description, hours, rate }));
+  }),
+
   getCurrentOpen: protectedProcedure.query(async ({ ctx }) => {
     try {
       // Get the most recent draft invoice