T47 Ship: a gallery whose wasm fetch fails retries, then tells the host; the host shows it at once and waits a minute for a slow start

AGENTS.md

@@ -184,7 +184,7 @@ Ely GPUI Component. A component library for GPUI, in light and dark.
 - What cannot build for wasm32 is absent there through `cfg(not(target_family = "wasm"))`, never faked: the live terminal, `Terminal` and `Launch` with their grid, keys and search, and the gallery's capture harness.
 - What a browser cannot run draws natively alone: `ui::native_only` leaves a window's opener out on the web, and the web's menu bar keeps View alone. The site shows native captures instead, light and dark: a story whose demo needs the desktop (files, the terminal's shell, the tray, the Dock, window moves) as its capture, and a live story that opens windows with those windows below. `python3 scripts/shots.py` takes them with the native gallery, window in front, into `frontend/public/shots` and `frontend/src/shots.json`.
 - A story is a gallery section: its title is a literal, one per page. Under `ui::Story` the one asked for draws without its title; the rest drop their demos (`ui::Section`), so nothing of theirs lays out, loads or moves. Their builders still run, so a demo that starts work on its own, a clock, a load or a shell, starts it through `ui::live`, which a story grants its own section alone and fails on a title no section has. A story the page lacks fails in the page.
-- Embedded in a page, the web gallery keeps gpui_web's hidden text field from taking focus, and hands focus back to the host, until a press or a key reaches it (`examples/gallery/index.html`); gpui_web focuses that field whenever its window is active. The host shows its own state until `{ ely: "ready" }`, sends the mode on ready and on every turn, and puts a skip link before the frame, since Tab inside gpui cycles within it.
+- Embedded in a page, the web gallery keeps gpui_web's hidden text field from taking focus, and hands focus back to the host, until a press or a key reaches it (`examples/gallery/index.html`); gpui_web focuses that field whenever its window is active. It retries a failed start twice, since frames that fetch the wasm at once can fail one, then posts `{ ely: "failed", error }`. The host shows its own state until `{ ely: "ready" }` or that failure, sends the mode on ready and on every turn, and puts a skip link before the frame, since Tab inside gpui cycles within it.
 - The gallery's pictures go through `asset!` and `ui::picture` or `ui::resource`: a file natively, on the web an address under `ELY_GALLERY_ASSETS`, since gpui reads no files there.
 - On the web a paste reaches the focused field as the browser's paste event, through `EntityInputHandler::paste`, so Paste stays unbound there (`TextInput`, `CodeEditor`). Code that reads the clipboard itself awaits `read_from_clipboard_async`: gpui_web's `read_from_clipboard` answers at once and finds nothing (`tables::DataGrid`'s Cmd-V).
 - The first frame wears the host's mode through `Theme::set_mode_now`, a mode sent before the window opens included; `set_mode` fades from the colors on screen.