fix: add missing logger to SubmitConfirmationModal

The error handler at line 384 referenced self.logger but __init__
never set it, causing AttributeError that silently swallowed the
real error from users.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

views/transaction_embed.py

@@ -6,6 +6,8 @@ Handles the Discord embed and button interfaces for the transaction builder.
 
 import discord
 
+from utils.logging import get_contextual_logger
+
 from services.transaction_builder import (
     TransactionBuilder,
     clear_transaction_builder,
@@ -235,6 +237,7 @@ class SubmitConfirmationModal(discord.ui.Modal):
         super().__init__(title="Confirm Transaction Submission")
         self.builder = builder
         self.submission_handler = submission_handler
+        self.logger = get_contextual_logger(f"{__name__}.SubmitConfirmationModal")
 
         self.confirmation = discord.ui.TextInput(
             label="Type 'CONFIRM' to submit",