T44d Web · Gallery builds for wasm32: one story per section by URL, themed by the host

The gallery's entry runs natively or, on wasm32, from a wasm_bindgen start
through gpui_web, single-threaded with WebGL2 fallback. ?page, ?story and
?theme choose what shows; an unknown one fails in the page and the log.
set_theme switches the mode later. Pictures load from ELY_GALLERY_ASSETS.
scripts/stories.py writes examples/gallery/stories.json from the pages.

examples/gallery/pages/project/mod.rs

@@ -14,7 +14,7 @@ mod tasks;
 mod time;
 
 use super::Page;
-use crate::{script::Step, ui::keep};
+use crate::{step::Step, ui::keep};
 
 pub const PAGE: Page = Page {
     number: 31,

examples/gallery/pages/project/time.rs

@@ -1,7 +1,8 @@
-use std::time::{Duration, Instant};
+use std::time::Duration;
 
 use ely_gpui_component::project::{DatabaseView, PomodoroTimer, Status, TimeEntry, TimeTracker};
 use gpui::{App, IntoElement, ParentElement, SharedString, Styled, Window, div, px};
+use web_time::Instant;
 
 use super::{board, quiet};
 use crate::{