feat: Update browser state restoration for Japanese UI

feat: Add Japanese UI text mapping for document and podcast modes

fix: Resolve E2E test failures by updating textarea selectors

fix: Fix E2E test failures and improve session initialization

refactor: Optimize timeout values for improved test performance

style: Apply comprehensive ruff formatting across entire codebase

feat: Migrate from isort, black, flake8 to ruff for unified linting and formatting

refactor: Update file upload and URL extraction tabs for improved clarity and functionality

refactor: Clean up code formatting and improve readability across multiple files

Add URL extraction feature and related tests

Reduce timeout values for UI element loading in common_steps.py

Improve application loading checks in common_steps.py

Refactor E2E test environment: consolidate setup and teardown logic into TestEnvironment class and update related fixtures

Refactor E2E test setup: consolidate environment setup into conftest.py and remove redundant steps from common_steps.py

Refactor unit tests for SessionManager and TextProcessor classes