Fix file uploader UI to light mode

Case Study: hide memo_*, default to Kepler Exoplanets

Fix Case Study: list all subdirs with chat_history.json, not just memo_*

Soften password eye icon color to medium gray #6b7280

Fix dark mode: password eye icon, code blocks in LLM output

Fix dark mode on Case Study back button and Open Case Study button

Login page improvements, light mode CSS, pyproject requires-python 3.12

removed dark mode

added cases and broswer mode

Rebrand to SciDER, fix subagent output display, disable Reasoning Bank for Streamlit

banned reasoning bank from streamlit client

removed password session

added claude api login page

added loader and executor

aligned uploader and agent path

updated streamlit client

clean HF Space commit (no binary history)