fix: Resolve knowledge card display and section regeneration bugs

Created by: Edouard-Legoupil

This commit addresses two distinct issues in the application:

1. Display All Outcome Knowledge Cards: The backend API has been updated to correctly handle requests for multiple outcome knowledge cards. The get_knowledge_cards endpoint in backend/api/knowledge.py now accepts a list of outcome_ids and uses an ANY clause in the database query to fetch all matching cards. The corresponding frontend code in Chat.jsx has been reverted to use the standard URLSearchParams API.

2. Fix Section Regeneration: The section regeneration feature was failing with a 400 Bad Request error because the temporary session created for the regeneration process was missing the proposal_template. The /regenerate_section/{proposal_id} endpoint in backend/api/proposals.py has been modified to load the proposal's template from the database and include it in the temporary Redis session. This resolves the error and restores the functionality.

Additionally, this commit includes fixes for several pre-existing test failures that were discovered during the development process.

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