Fix metric visibility in deep dive

[RajvardhanPatil07]

What changed

• replaced the default st.metric row in the deep-dive view with a custom responsive metric grid
• kept the close price visible at full precision instead of allowing Streamlit to truncate it with an ellipsis
• preserved the daily return delta styling in the new layout

Why

The close price in the deep-dive metrics was getting cut off (INR 1,4...) on narrower layouts, which made a key market value hard to read.

User impact

The Close metric now stays readable in real time across desktop widths, while the rest of the metrics continue to wrap responsively.

Validation

• python3 -m py_compile app.py alphawatch/*.py
• Streamlit smoke test via streamlit.testing.v1.AppTest