Bring back the leftward extension via negative margin-left so the
scroll viewport reaches AppShell.Main's left edge, then offset the
.grid with padding-left = extendLeft so the first cell still lines
up with page-content on load. The extended area becomes scrollable
empty space the user can pan into — same shape as Notion's inline
databases.
Done with one new CSS var (--embed-grid-pad-left) consumed by the
.grid in grid.module.css. Standalone full-page bases never set the
var, so it's a no-op there.
Removing the leftward extension. With negative margin-left, the
grid grew leftward past page-content and the first column appeared
near the sidebar edge on load — wrong; Notion keeps the first column
aligned with page text. Drop margin-left and the extendLeft
calculation; only extend rightward toward AppShell.Main's right edge.
Leftward viewport extension (so frozen columns can lock at the
sidebar edge during scroll) becomes meaningful once we add frozen
columns. Deferred until that feature lands.
The previous approach (position: relative + explicit width +
inset-inline-start) didn't physically grow the box in some flex
contexts, so the grid stayed at the parent's width. Switch to
negative margin-left / margin-right on the grid wrapper only —
with width: auto, the rendered width becomes parent + |margin|,
extending the box past the parent without any positioning hacks.
The toolbar keeps its natural parent-constrained width (no extension)
so it stays aligned with the page text above. Two CSS vars,
--embed-extend-l / --embed-extend-r, are computed on mount + on
ResizeObserver from the wrapper and the closest wider ancestor.
When a base is embedded inline in a doc page, measure the parent
container's available area and extend toolbar + grid sections to fill
it via CSS variables (--embed-width / --embed-shift / --embed-pad).
Inner content is re-padded so toolbar buttons and the first column
visually align with the page text, while the box itself reaches the
viewport edges for horizontal scroll headroom on wide databases.
Sticky inset-inline-start keeps the toolbar pinned to the page-content
edge during horizontal scroll. Standalone full-page bases are
unaffected (the embedded prop defaults to false).
Mounts useBaseRowsCountQuery alongside the rows query so the count is
fetched eagerly and the cache is warm by the time the toolbar consumes
it. Gating on `currentUser` (not just `base`) ensures the persisted
view-draft has hydrated from localStorage before the first count fires
— otherwise a post-refresh count races ahead of the user's saved
filter and ships without it.
Philipinho