[Azganoth]

Summary

Insert > Callout in the menu bar and context popup now offers every supported dialect. The inferred dialect's types stay first, followed by submenus for the other dialects. A choice authors the new callout in that dialect and participates in inference for later insertions. Existing callouts still change type only within their own dialect, and the command palette keeps its inferred-dialect picker.

Escape also suppresses a queued pointer-release popup opening, so a dismissed context popup stays closed until a new pointer gesture.

Related Issue

Closes #793

Verification

• pnpm exec vitest run src/features/editor/plugins/contextPopup.test.ts src/features/editor/plugins/blockSelectionKeyboard.test.ts src/features/editor/components/editor-context-popup.test.tsx verifies dismissal before a queued pointer release, reopening on a new gesture, selection behavior, and menu interaction. The new dismissal regression fails without the fix.
• pnpm check:frontend verifies explicit insertion, dialect inference, Markdown round trips, Undo, keyboard menu selection, icons, and focus restoration, alongside the full frontend checks.
• pnpm exec tsc -p e2e/desktop/tsconfig.json --noEmit validates the desktop scenarios.
• Windows CI passes frontend checks, backend checks and the Rust dependency audit, and the full desktop E2E suite, including the dialect menus and clean teardown.