docs: rework the landing and showcases, add the 0.5.0 guides, and cut per-page transfer

.changeset/full-formula-engine.md

@@ -3,9 +3,9 @@
 "@sheetwrite/core": minor
 ---
 
-Add `@sheetwrite/formulas`, an optional full formula engine. It is the same Rust engine as `@sheetwrite/wasm`, built with more functions, and it has the same API and loaders. The default `@sheetwrite/wasm` engine does not change: its function set and its binary size stay the same.
+Add `@sheetwrite/formulas`, an optional full formula engine. It is the same Rust engine as `@sheetwrite/wasm`, built with more functions, and it has the same API and loaders. The full engine is a separate build: it adds nothing to the function set or binary of the default `@sheetwrite/wasm` engine.
 
 - Select the full engine one time, before the app creates a grid or a store: `import * as formulas from "@sheetwrite/formulas"; await initSheetwrite(undefined, formulas);`. A call that selects a different engine after this rejects. Calls without an engine keep the selected engine, so framework adapters work with both engines.
 - The full engine adds 36 statistical distribution functions: `NORM.DIST`, `NORM.INV`, `NORM.S.DIST`, `NORM.S.INV`, `T.DIST`, `T.DIST.2T`, `T.DIST.RT`, `T.INV`, `T.INV.2T`, `CHISQ.DIST`, `CHISQ.DIST.RT`, `CHISQ.INV`, `CHISQ.INV.RT`, `F.DIST`, `F.DIST.RT`, `F.INV`, `F.INV.RT`, `BINOM.DIST`, `POISSON.DIST`, `EXPON.DIST`, `GAMMA`, `GAMMALN`, `GAMMA.DIST`, `GAMMA.INV`, `BETA.DIST`, `BETA.INV`, `LOGNORM.DIST`, `LOGNORM.INV`, `WEIBULL.DIST`, `CONFIDENCE.NORM`, `CONFIDENCE.T`, `STANDARDIZE`, `FISHER`, `FISHERINV`, `PHI`, and `GAUSS`. They use the Excel argument rules and error values.
 - Formula assist suggests only the functions of the selected engine. With the default engine, these functions return `#NAME?`.
-- The full engine binary is 794,725 bytes (240,690 bytes with Brotli). The default engine binary is 758,385 bytes (228,822 bytes with Brotli).
+- In this release, the full engine binary is 1,074,934 bytes (326,278 bytes with Brotli) and the default engine binary is 791,937 bytes (238,071 bytes with Brotli).

.changeset/memory-adapter-live-store.md

@@ -0,0 +1,5 @@
+---
+"@sheetwrite/core": patch
+---
+
+`MemoryPersistenceAdapter` commits are faster on large documents. Each document keeps one live store, so a commit applies its transaction instead of rebuilding the whole workbook from a snapshot, re-exporting it and copying it. With a 110,000-cell document, a one-cell commit no longer blocks for about 450 ms. `load` and conflict responses export a fresh snapshot on demand. A rejected or aborted commit, including a failed member of an atomic batch, still leaves the document unchanged.

.changeset/report-oversized-undo.md

@@ -2,4 +2,4 @@
 "@sheetwrite/core": patch
 ---
 
-Report an undo that is too large instead of failing silently. When the data that an undo restores is above the transaction limits (`maxEncodedBytes` or `maxOperations`), `grid.undo()` changes nothing. The Grid now emits `mutation-rejected` with the `resource-limit` issue and removes that entry from the undo history, so older edits can still be undone. Before, the Grid sent no event and kept the entry, so every later undo failed the same way. At the default 8 MiB, this applies to undo of a clear larger than about 1,000,000 number cells.
+Report an undo that is too large instead of failing silently. When the data that an undo restores is above the transaction limits (`maxEncodedBytes` or `maxOperations`), `grid.undo()` changes nothing. The Grid now emits `mutation-rejected` with the `resource-limit` issue and removes that entry from the undo history, so older edits can still be undone. Before, the Grid sent no event and kept the entry, so every later undo failed the same way. Large restores first use the compact `restoreBlock` encoding and atomic batches, so this applies only to an undo that still exceeds those ceilings.

.changeset/steady-toolchain-refresh.md

@@ -2,4 +2,4 @@
 "@sheetwrite/wasm": patch
 ---
 
-Rebuild the columnar store on the pinned Rust 1.98.1 toolchain. The source now follows the new rustfmt style, and clippy-selected rewrites replace `unwrap` calls after `is_some` in the paged setters, use the newer `is_multiple_of`, `as_chunks`, and `slice::from_ref` standard-library forms, and drop redundant counters and conversions.
+Adopt the current rustfmt style and clippy-selected rewrites in the columnar store: replace `unwrap` calls after `is_some` in the paged setters, use the newer `is_multiple_of`, `as_chunks`, and `slice::from_ref` standard-library forms, and drop redundant counters and conversions.

docs/CHANGELOG.md

@@ -2,6 +2,11 @@
 
 ## Unreleased
 
+- Keep browser smoke specs independent of built workspace packages by sharing pure engine workbook and collaboration/database seed modules with the showcases.
+- Cut uncompressed page weight by 21–56% across the site (7–18% after Brotli): share one popover panel per distinct hovered symbol, serve Expressive Code styles once from the cached site stylesheet instead of inlining them on every page, keep landing snippets, the docs page index, and the capability inventory out of the bundle every page loads, and stop sending landing and showcase styles to documentation pages. Hidden landing code tabs load on intent.
+- Deploy content-hashed assets and Pagefind shards with a one-year immutable cache; HTML and stable entry files still revalidate on each deployment.
+- Make the landing hero and architecture illustrations seekable through keyboard-accessible numbered chapters, with replay-safe state and reduced-motion still frames. Add undo/redo, tile-fetch, recalculation, and host-save animation sequences.
+- Rework the showcase gallery: separate Capabilities and Framework adapters sections, a fading blueprint background, aligned preview heights, and theme-aware preview contrast. Enrich landing feature illustrations and align architecture event details and reload glyphs.
 - Replace the documentation layout with a task-focused home, grouped navigation, a dedicated reading panel, and redesigned API rows. Add explicit Home and Showcases links on desktop and mobile.
 - Keep the overview free of the guide outline; retain the right rail on wide guide pages and the collapsible outline on mobile.
 - Add a filter for large API indexes; start API members collapsed, preserve deep-link expansion, remove signature copy controls, and link source locations.