build(web): copy web fonts with cargo xtask, not sh

Replace the Trunk post_build hook packaging/web/copy-fonts.sh with `cargo xtask web-fonts` (xtask/src/web_fonts.rs), so the web build only needs trunk, the wasm32 target and cargo, with no POSIX shell, and works the same on Windows.

The new task reuses crates/text/build/web_fonts.rs for list parsing and URLs, so build.rs and the copier can't disagree on fonts/<sha16>/<file>. It still does nothing without CRAFT_FONTS_DIR, checks each file's SHA-256 against the manifest, and copies the licence next to each face. A listed face that an older craft-fonts checkout lacks is now skipped with a warning, as build.rs does, instead of failing the build. A relative CRAFT_FONTS_DIR is resolved from the workspace root.

Update the references in Trunk.toml, fonts.rs, build.rs, craft_fonts.rs and web-fonts.txt, and document the web build's requirements in docs/development.md. Add tests for the copy, a hash mismatch and the no-op case.

Signed-off-by: Ahmed Moussa <moussa.ahmed95@gmail.com>

xtask/src/main.rs

@@ -12,6 +12,7 @@ mod layers;
 mod sha256;
 mod stats;
 mod version;
+mod web_fonts;
 
 use std::path::{Path, PathBuf};
 use std::process::{Command, ExitCode};
@@ -32,6 +33,8 @@ commands:
   ico <out.ico> <png>...
                   pack PNGs into a Windows .ico (used by packaging/icons.sh)
   stats [--exact] count tests and lines per crate (--exact: ask the test harness via `-- --list`)
+  web-fonts       copy the craft-fonts faces in crates/text/web-fonts.txt into the web site (the Trunk
+                  post_build hook; a no-op without CRAFT_FONTS_DIR)
 ";
 
 fn main() -> ExitCode {
@@ -49,6 +52,7 @@ fn main() -> ExitCode {
         Some("ico") => ico::run(&rest),
         Some("version") => version::run(&root(), &rest),
         Some("stats") => stats::run(&root(), rest.contains(&"--exact")),
+        Some("web-fonts") => web_fonts::run(&root()),
         Some("-h" | "--help" | "help") | None => {
             print!("{USAGE}");
             Ok(())