Direct Buildium A/P import: bills, payments, one-off checks via GL Account Map

- public.bills.line_items + line-aware accounting mirror (one bill_item per
  Buildium line with its mapped platform account)
- buildium-sync bills: strict per-line resolution through
  buildium_gl_account_links (unmapped -> bill held + flagged); pulls
  /bills/{id}/payments (check#, bank, date) and /bankaccounts/{id}/checks
  (one-off checks become paid bill+payment pairs)
- import-mode companies get direct JEs (buildium_bill Dr expense/Cr AP,
  buildium_billpay Dr AP/Cr mapped bank) + cleared register rows; sets
  buildium_gl.exclude_ap so the nightly GL pull skips Bill/Bill Payment/Check
- buildium-gl-sync: exclude_ap transaction-type filter; preserve buildium_gl
  config keys when advancing the watermark
- Settings: Pull Bills & Expenses card with held/unmapped reporting

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

supabase/functions/buildium-gl-sync/index.ts

@@ -273,6 +273,23 @@ Deno.serve(async (req) => {
         }
         companyResult.pulled = txById.size;
 
+        // Direct A/P import (buildium-sync "bills") posts Bill / Bill Payment /
+        // Check journal entries itself for this company — skip those
+        // transaction types here so they aren't double counted.
+        if (cfg?.buildium_gl?.exclude_ap) {
+          // NOTE: owner "Refund" transactions stay in the GL pull — they are
+          // not returned by the /checks endpoint the direct import reads.
+          const AP_TYPES = new Set(["bill", "bill payment", "billpayment", "check", "bill credit", "vendor credit", "applied vendor credit"]);
+          let excludedAp = 0;
+          for (const [txId, tx] of [...txById.entries()]) {
+            if (AP_TYPES.has(String(tx.transactionType || "").toLowerCase())) {
+              txById.delete(txId);
+              excludedAp++;
+            }
+          }
+          companyResult.excluded_ap = excludedAp;
+        }
+
         // ---- Already-imported transaction ids for this company ----
         const existingIds = new Set<string>();
         for (let offset = 0; ; offset += 1000) {
@@ -432,6 +449,7 @@ Deno.serve(async (req) => {
           const nextCfg = {
             ...cfg,
             buildium_gl: {
+              ...(cfg.buildium_gl ?? {}),
               last_synced_date: until,
               last_run_at: new Date().toISOString(),
               last_result: {