Card selection. Clicking a card on the canvas now selects it (React Flow
elementsSelectable was off), drawing an accent bounding box with square
corner handles around the card — shapes and frames show their resize handles
instead. Shift-click multi-select works too; clicking the canvas clears the
selection. New shared SelectionRing in components/Canvas.tsx.
Changed
Toolbar icons. Select, Sticky, and Image now use the full-color artwork
from app/custom_icons/, inlined as React components in
components/ToolIcons.tsx (IDs namespaced per icon so gradients/clips don't
collide). The other tools keep their Phosphor glyphs. All toolbar icons are
larger: 26px for the custom artwork, 22px for the Phosphor glyphs.
Active tool styling. The active toolbar button now uses the same subtle
elevated-gray fill as hover instead of the solid dark accent pill.
Fixed
Shapes flyout dismissal. Clicking outside the shapes/diagram picker now
closes it. The old position: fixed click-catcher was silently confined to
the toolbar (its transform + backdrop-filter make it the containing block for
fixed descendants); replaced with a document-level pointer-down listener.
