Apply review fixes

- packaging/web/README.md
- apps/deckcraft-web/src/host.rs

apps/deckcraft-web/src/host.rs

@@ -27,7 +27,7 @@
 //!   - Export (PDF, pictures, outline, GIF, handouts, a Save As type that isn't a presentation)
 //!     and Print: `false`. They are copies; the presentation's file stays the same.
 //! - `deckcraft:dirty` whenever unsaved changes appear or go away, `deckcraft:failed` when the
-//!   app couldn't start.
+//!   app couldn't start or refused a file over 2 GiB.
 //!
 //! In host mode the app starts with an empty presentation instead of the sample, which gives way to
 //! the first file the host sends; the host guards leaving the page, and `?author=` names the user

packaging/web/README.md

@@ -90,7 +90,7 @@ Messages are plain objects with a `type`:
 | `deckcraft:open` | from the page | `name` (a bare file name, such as `Talk.pptx`), `bytes` (`ArrayBuffer` or `Uint8Array`). Opens like File › Open: a presentation (.pptx, .potx, .ppsx, .deckcraft) has that name as its file; an outline (.txt, .md, .rtf), a file sent without a name and a damaged file open untitled. |
 | `deckcraft:save` | to the page | `name`, `saveAs`, `bytes` (a transferred `ArrayBuffer`), for every file DeckCraft would otherwise download. The page stores it. |
 | `deckcraft:dirty` | to the page | `dirty`, whenever unsaved changes appear or go away. |
-| `deckcraft:failed` | to the page | `error`, when the app couldn't start (no WebGPU or WebGL2). |
+| `deckcraft:failed` | to the page | `error`, when the app couldn't start (no WebGPU or WebGL2) or refused a file over 2 GiB. |
 
 `saveAs` says whether the file becomes the presentation's file, as on the desktop: