feat: open inline images in a lightbox on double-click

[yusoufu]

Problem

Inline images inserted into a note can only be viewed at the size BlockNote renders them at — there is no way to see a full-size preview without opening the file outside Tolaria.

Solution

Double-clicking any <img> inside the editor opens it in a centered shadcn Dialog at up to 90vw / 90vh. Esc, backdrop click, or the overlay close it. Single-click is left alone so BlockNote selection / cursor placement keep working as before.

A shared dblclick listener on the editor container picks up image targets via getDoubleClickedImageSrc, which also filters tracking pixels (<16 px naturalWidth/Height) so empty inline GIFs don't open a blank viewer.

Changes

• src/utils/imageLightboxTarget.ts — pure helper extracting an image src from an event target, with a tracking-pixel guard. Five unit tests.
• src/hooks/useImageLightbox.ts — wires dblclick on a container ref to open/close state.
• src/components/ImageLightbox.tsx — shadcn Dialog with a transparent backdrop showing the full-size image.
• src/components/SingleEditorView.tsx — three-line wire-up (hook + render).

Test plan

• pnpm lint — 0 errors
• pnpm exec tsc --noEmit
• pnpm test — 3217/3217 pass (5 new)
• pnpm playwright:smoke — all green (ran in pre-push)
• Native Tauri QA (manual) — drop an image into a note, double-click, confirm lightbox; press Esc, click backdrop

🤖 Generated with Claude Code

[LucaRonin]

Merged after some tweaks — closing this now. Thanks again for the contribution!