Group layers by board, zoom-to-board navigation, and all-boards export

[daniellee-ux]

Summary

Two commits reworking multi-board UX in the editor:

Layers panel (63b34f4)

• Fix the boards rail layout: the canvas board caption's CSS class (.ox-board-label) collided with the sidebar's board-name class, absolutely positioning the rail's names over the header/thumbnails. The caption is now .ox-board-caption.
• Clicking a board (rail) now actually navigates: new viewport.fitTo(rect) zooms + centers that board (with headroom for its caption).
• The LAYERS tree is grouped by board, Figma-style: per-board collapsible sections with sticky headers (name + count). The active board's group auto-expands and others collapse on switch (filter-like), with manual expand/collapse respected — overrides are latched per selection so DOM churn and stale selections can't defeat them, and reset when the board id sequence changes. Cross-board canvas selections force their group open and scroll into view. Single-board designs keep the flat list.

Toolbar + export (39c5c01)

• Remove the toolbar "Active board" dropdown — the boards rail owns board switching now; the dropdown's remaining job (what does Export target?) moves into the Export menu.
• Export menu on multi-board designs: current-board items name the board ("PNG — Cover"), plus an all-boards section — "PDF — all boards" (one page per board via exportPdfPages) and "PNG/SVG — all boards (.zip)" (exportZip via fflate, entries named NN-label).
• Compress PDF rasters (jsPDF compress + FAST): a 4-board PDF drops from 56 MB (raw pixels) to 0.4 MB, lossless; the single-board PDF shares the same path.
• Pre-bundle jspdf/fflate in dev so a first export can't trigger a mid-session page reload; cap dropdown popovers (max-width + label ellipsis) since menu labels now carry user content.

Verification

• Driven live in the browser (multi-board fixture): rail click zooms to the board + filters the tree; manual collapse survives canvas DOM churn; cross-board selection opens its group and selects the object; single-board designs unchanged; window.__ox.lint() clean.
• Export blobs inspected programmatically: zip central directory lists 01-cover…04-outro entries; PDF has 4 pages with correct per-board page boxes; current-board PNG still downloads.
• npm run typecheck + npx tsc --noEmit -p apps/demo pass.
• Two adversarial multi-agent review passes ran over the diffs; all confirmed findings are fixed in these commits.

🤖 Generated with Claude Code

[daniellee-ux]

Codex review (codex exec review --base main, codex-cli 0.139.0) verdict:

I did not identify any discrete correctness issues introduced by the changes. The new multi-board focus, grouped layers, and export paths appear consistent with the existing canvas/export architecture, and typechecks pass.

No findings to act on — leaving the PR as-is for merge.