fix: add dark mode support for table previews in Jupyter

[dimitri-yatsenko]

Summary

Adds automatic dark mode support for DataJoint table previews in Jupyter Lab/Notebook using CSS prefers-color-scheme media query.

Problem

Table previews were unreadable in Jupyter Lab dark mode because CSS was hardcoded for light themes (black text on white background).

Before (dark mode):

Solution

Added CSS media query that automatically detects dark mode preference:

@media (prefers-color-scheme: dark) {
    .Table tr:nth-child(odd) {
        background: #2d2d2d;
        color: #e0e0e0;
    }
    /* ... */
}

Dark mode colors:

Element	Background	Text
Table header	#4a4a4a	#ffffff
Odd rows	#2d2d2d	#e0e0e0
Even rows	#3d3d3d	#e0e0e0
Primary key	-	#bd93f9 (purple)
Borders	#555555	-

Benefits

• No JavaScript required - uses native CSS media query
• Automatic detection - follows system/browser dark mode setting
• No config changes - works out of the box
• Backward compatible - light mode unchanged

Closes

• Jupyterlab shows tables in black on black #1167

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