feat(edit-transaction): edit modal with notes, inline tags, and split management

- New EditTransactionModal with scrollable body (sticky header/footer)
- Statement transactions: read-only core fields; manual transactions: editable date/amount/description
- Override fields for all: merchant, category, type, notes (textarea)
- InlineTags sub-component: add/remove tags without dropdown clipping issues
- Live split display via useTransactionSplits, opens SplitModal for editing
- PATCH /api/transactions/:id extended for description/amount/transaction_date (manual only)
- Transactions page: edit button per row, notes shown below description in italic

src/app/api/transactions/[id]/route.ts

@@ -23,13 +23,44 @@ export async function PATCH(
   const transactionId = Number(id);
   const body = await req.json();
 
-  const { category, merchant_normalized, notes, transaction_type } = body as {
+  const { category, merchant_normalized, notes, transaction_type, my_share_percent, description, amount, transaction_date } = body as {
     category?: string;
     merchant_normalized?: string;
     notes?: string;
     transaction_type?: string;
+    my_share_percent?: number | null;
+    description?: string;
+    amount?: number;
+    transaction_date?: string;
   };
 
+  if (my_share_percent !== undefined && my_share_percent !== null) {
+    if (typeof my_share_percent !== "number" || my_share_percent <= 0 || my_share_percent > 100) {
+      return NextResponse.json({ error: "my_share_percent must be between 1 and 100" }, { status: 400 });
+    }
+  }
+
+  // Direct field edits — only allowed for manual transactions (statement_id IS NULL)
+  const directFields = [description, amount, transaction_date].filter((v) => v !== undefined);
+  if (directFields.length > 0) {
+    const txRows = await queryRaw<{ statement_id: number | null }>(
+      `SELECT statement_id FROM transactions WHERE id = $1`,
+      [transactionId]
+    );
+    if (!txRows[0]?.statement_id) {
+      const setClauses: string[] = [];
+      const params: unknown[] = [];
+      let idx = 1;
+      if (description !== undefined) { setClauses.push(`description = $${idx++}`); params.push(description); }
+      if (amount !== undefined) { setClauses.push(`amount = $${idx++}`); params.push(amount); }
+      if (transaction_date !== undefined) { setClauses.push(`transaction_date = $${idx++}`); params.push(transaction_date); }
+      if (setClauses.length) {
+        params.push(transactionId);
+        await queryRaw(`UPDATE transactions SET ${setClauses.join(", ")} WHERE id = $${idx}`, params);
+      }
+    }
+  }
+
   // transaction_type is a direct correction on the transactions table
   if (transaction_type !== undefined) {
     if (!VALID_TYPES.includes(transaction_type)) {
@@ -41,8 +72,8 @@ export async function PATCH(
     );
   }
 
-  // category/merchant/notes go through the overrides table
-  const hasOverride = category !== undefined || merchant_normalized !== undefined || notes !== undefined;
+  // category/merchant/notes/my_share_percent go through the overrides table
+  const hasOverride = category !== undefined || merchant_normalized !== undefined || notes !== undefined || my_share_percent !== undefined;
   if (!hasOverride) {
     return NextResponse.json({ ok: true });
   }
@@ -51,6 +82,7 @@ export async function PATCH(
   if (category !== undefined) data.category_override = category;
   if (merchant_normalized !== undefined) data.merchant_normalized = merchant_normalized;
   if (notes !== undefined) data.notes = notes;
+  if (my_share_percent !== undefined) data.my_share_percent = my_share_percent;
 
   const override = await prisma.transaction_overrides.upsert({
     where: { transaction_id: transactionId },
@@ -60,6 +92,7 @@ export async function PATCH(
       category_override: category || null,
       merchant_normalized: merchant_normalized || null,
       notes: notes || null,
+      my_share_percent: my_share_percent != null ? String(my_share_percent) : null,
     },
   });