Support public dir (#4783)

* Add optional static_dir support

- add optional application.static_dir field defaulting to none
- copy configured static directory into web output during build/serve
- document config knob and add unit tests
- force full rebuild when static_dir contents change
- sync removes stale outputs and logs copy activity
- track static manifest next to platform dir

Tests: cargo fmt

* default to public dir to match vite

* static_dir -> public_dir

* wip

* deser as none...

* wip... use .manifest.json

* implement dumb form of asset manifest generation

* implement manifest using asset system directly

* cleanup

* dont create extra asset dir for server

---------

Co-authored-by: Evan Almloff <evanalmloff@gmail.com>
Co-authored-by: Jonathan Kelley <jkelleyrtp@gmail.com>

packages/cli/src/config/dioxus_config.rs

@@ -17,6 +17,7 @@ impl Default for DioxusConfig {
         Self {
             application: ApplicationConfig {
                 out_dir: None,
+                public_dir: Some("public".into()),
                 tailwind_input: None,
                 tailwind_output: None,
                 ios_info_plist: None,
@@ -55,3 +56,42 @@ impl Default for DioxusConfig {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn static_dir_defaults_to_public() {
+        let config = DioxusConfig::default();
+        assert_eq!(
+            config.application.public_dir,
+            Some(std::path::PathBuf::from("public"))
+        );
+    }
+
+    #[test]
+    fn static_dir_can_be_overridden() {
+        let source = r#"
+            [application]
+            public_dir = "public2"
+        "#;
+
+        let config: DioxusConfig = toml::from_str(source).expect("parse config");
+        assert_eq!(
+            config.application.public_dir.as_deref(),
+            Some(std::path::Path::new("public2"))
+        );
+    }
+
+    #[test]
+    fn static_dir_can_be_disabled() {
+        let source = r#"
+            [application]
+            public_dir = ""
+        "#;
+
+        let config: DioxusConfig = toml::from_str(source).expect("parse config");
+        assert_eq!(config.application.public_dir.as_deref(), None);
+    }
+}