fix(desktop): table first column no longer goes dark in light mode

[oratis]

The bug

On a dark-mode Mac with the app in light theme, rendered Markdown tables showed a dark, unreadable first column (and "Layer"-style header cell), while the rest of the table was light.

Root cause

The imported Nord theme (src/index.css @import "@milkdown/theme-nord/style.css") stripes table columns and flips them dark via the OS color scheme:

.milkdown-theme-nord.prose :where(td, th):nth-child(odd) { background-color: var(--color-gray-50); }
@media (prefers-color-scheme: dark) {
  .milkdown-theme-nord.prose :where(td, th):nth-child(odd) { background-color: var(--color-gray-900); }
}

Our theming is class-driven (html.theme-dark/theme-sepia), not OS-driven. So when OS=dark but app=light, the odd (first) column became gray-900 under our dark text → unreadable. Nord's selector (specificity 0,3,0) also out-specified our .milkdown .editor th (0,2,1).

Fix

Re-assert table backgrounds + row borders from our --mk-* theme variables at specificity (0,3,1) so tables follow the app theme, not the OS:

• header cells (th) keep --mk-bg-elevated
• body cells (td) are transparent
• no per-column striping

Correct in light / dark / sepia regardless of the OS appearance.

Verification

CSS-only. The failing condition (OS dark + app light) isn't reproducible in a headless preview, so this relies on the specificity trace above + the frontend CI build + on-device check on a dark-mode Mac.

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