[Azganoth]

Summary

Make non-table editor context popups compact: icon rows share the available width, sparse rows use short labels, and separators distinguish command groups. Full accessible names and existing command and focus behavior remain intact.

Related Issue

Closes #774

Verification

• pnpm test:frontend src/features/editor/components/editor-context-popup.test.tsx checks labels, command dispatch, keyboard navigation, focus handling, and unchanged table controls.
• pnpm check:frontend passed formatting, type checking, lint, the production build, and coverage checks.
• Automated checks of the actual component in Chromium on Windows verified desktop and narrow layouts, English and pseudo-locale labels, theme and accent changes, and footnote navigation dispatch.

CI passed frontend checks, backend checks, and desktop E2E, including the updated block-selection layout assertions. Desktop E2E was not run locally.

Notes

Table popups retain their existing presentation. Their redesign belongs to #775.