Improve accessibility and code quality across components

[kbtale]

Summary:
Accessibility and lint cleanup. Module tools get labels tied to their inputs, keyboard-operable controls, and SVG titles. Biome lint drops from 83 diagnostics to zero.

Changes Included:
CoreBitRow: bit toggles use real checkboxes.
Sidebar menu: list items became native buttons; removed role="menu" and role="menuitem", which had no menu behavior behind them.
Date picker trigger: now a button.
Labels wired with htmlFor/id across module tools: Caesar, Morse, NATO, Braille, Semaphore, Hex, Roman, Rule 72, EAN, ASCII, Color Theory, Storage Units, Doomsday, Ordinal, Periodic Table.
ASCII table and periodic table cells are buttons.
SVG titles added: logo, semaphore figure, resistor diagrams.
Biome fixes: parseInt radix, Number.isNaN, type-only React imports, guarded root lookup in main.tsx.
Tests updated for the new controls; user-event added as a dev dependency.

Type of Change

• Bug fix
• New feature
• Refactoring
• Performance improvement
• Accessibility improvement
• Documentation update

Checklist

• npm run check passes (Biome lint & format)
• npm run test passes (all unit tests)
• npm run build passes (TypeScript strict mode)
• New i18n keys added to all 3 locales (en, es, it)
• No inline styles added (use SCSS modules)