feat: replace SVG icons with Lucide icons in reference data pages

- Updated the "Nueva Sección" button in customs_sections, customs_warehouses, incoterms, invoice_types, material_types, payment_methods, pedimento_codes, pedimento_regimens, sectors, states, transport_modes, and transport_types pages to use the Plus icon from Lucide.
- Updated the "Actualizar" button in the same pages to use the RefreshCw icon from Lucide.
- Added a new edit dialog component for customs brokers with a comprehensive form for editing broker details, including validation and loading states.

backend/alembic/versions/add_timestamps_to_classes.py

@@ -1,67 +0,0 @@
-"""Add timestamp fields to classes table
-
-Revision ID: add_timestamps_classes
-Revises: 7937209f9718
-Create Date: 2025-11-16 00:20:00.000000
-
-"""
-from typing import Sequence, Union
-
-from alembic import op
-import sqlalchemy as sa
-
-
-# revision identifiers, used by Alembic.
-revision: str = 'add_timestamps_classes'
-down_revision: Union[str, None] = '7937209f9718'
-branch_labels: Union[str, Sequence[str], None] = None
-depends_on: Union[str, Sequence[str], None] = None
-
-
-def upgrade() -> None:
-    # Add created_at column with default value
-    op.execute("""
-        ALTER TABLE a76.classes 
-        ADD COLUMN created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP NOT NULL
-    """)
-    
-    # Add updated_at column with default value
-    op.execute("""
-        ALTER TABLE a76.classes 
-        ADD COLUMN updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP NOT NULL
-    """)
-    
-    # Add deleted_at column (nullable for soft deletes)
-    op.execute("""
-        ALTER TABLE a76.classes 
-        ADD COLUMN deleted_at TIMESTAMP WITH TIME ZONE
-    """)
-    
-    # Create trigger to auto-update updated_at
-    op.execute("""
-        CREATE OR REPLACE FUNCTION a76.update_classes_updated_at()
-        RETURNS TRIGGER AS $$
-        BEGIN
-            NEW.updated_at = CURRENT_TIMESTAMP;
-            RETURN NEW;
-        END;
-        $$ language 'plpgsql';
-    """)
-    
-    op.execute("""
-        CREATE TRIGGER update_classes_updated_at
-        BEFORE UPDATE ON a76.classes
-        FOR EACH ROW
-        EXECUTE FUNCTION a76.update_classes_updated_at();
-    """)
-
-
-def downgrade() -> None:
-    # Drop trigger and function
-    op.execute("DROP TRIGGER IF EXISTS update_classes_updated_at ON a76.classes")
-    op.execute("DROP FUNCTION IF EXISTS a76.update_classes_updated_at()")
-    
-    # Drop columns
-    op.execute("ALTER TABLE a76.classes DROP COLUMN IF EXISTS deleted_at")
-    op.execute("ALTER TABLE a76.classes DROP COLUMN IF EXISTS updated_at")
-    op.execute("ALTER TABLE a76.classes DROP COLUMN IF EXISTS created_at")