Feat/update UI

[Essmaw]

No description provided.

[Copilot]

Pull request overview

This PR modernizes the UI, refactors code organization, and fixes various spelling errors across the codebase. It introduces a centralized messages module, updates datetime handling to use UTC, improves user level data management, and enhances the Streamlit UI with better logo handling and level change callbacks.

Changes:

• Extracted message constants to a centralized src/messages.py module for better maintainability
• Updated datetime usage to include UTC timezone awareness
• Added level change callback with conversation reset functionality
• Enhanced UI with improved logo display and sidebar spacing adjustments
• Fixed multiple French spelling errors in chapter titles and user-facing messages
• Improved query formatting to limit context to recent questions

Reviewed changes

Copilot reviewed 8 out of 10 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
src/messages.py	New file centralizing chatbot message constants (out-of-scope, unrelated queries, suggestions)
src/streamlit_app.py	UI improvements including logo handling, level change callbacks, query formatting updates, and parameter renaming for clarity
src/query_chatbot.py	Import updates, UTC datetime usage, function signature changes, and code simplifications
src/logger.py	Added ui_logger parameter documentation for append mode logging
prompt_templates/common.txt	Added user level placeholder and formal address ("vouvoiement") instruction
environment.yml	Fixed spelling: "formaters" → "formatters"
data/chapters_and_levels.yaml	Fixed French translations and spelling in chapter titles
config_app.toml	Removed trailing newline
assets/style.css	Formatting cleanup (trailing whitespace)
.pre-commit-config.yaml	Updated tool versions and expanded typos exclusion pattern

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[Copilot]

Pull request overview

Copilot reviewed 9 out of 12 changed files in this pull request and generated 9 comments.

Comments suppressed due to low confidence (1)

src/streamlit_app.py:348

• generate_response documents/types context as str, but it is used as a list of retrieved Document chunks (compared to [] and passed as relevant_chunks). Update the type hints/docstring to list[Document] (or similar) to match actual usage and avoid confusing callers/tools.

def generate_response(
    user_query: str,
    context: str,
    model_name: str,
    provider_llm_name: str,
    prompt_path: str,
    student_level: str | None,
    level_relevant_chapters: list[str],
    course_level_infos: dict[str, CourseLevel],
) -> tuple[str, int, int]:
    """Generate a response to the user question.

    Parameters
    ----------
    user_query : str
        The user question.
    context : str
        The relevant context retrieved from the vector database.

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