Resolves #5045: Trim slashes to prevent base path resolution issues in web (#5049)

* issue-5045 Trim slashes to prevent base path resolution issues in web

* Revert "issue-5045 Trim slashes to prevent base path resolution issues in web"

This reverts commit 480cd48d8537a56f57538c21e7cc98b75e8dc8ad.

* This is a more comprehensive approach. No matter how "/" gets set into
DIOXUS_ASSET_ROOT (cli arg, dioxus toml, or env var) it will be
normalized when used.

* Move the trim fix to the locations we set the variable DIOXUS_ASSET_ROOT as
this environment variable is not meant for public consumption.

* pull out trimming into a method

---------

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

packages/cli/src/build/builder.rs

@@ -521,7 +521,7 @@ impl AppBuilder {
             envs.push(("RUST_BACKTRACE".into(), "1".to_string()));
         }
 
-        if let Some(base_path) = krate.base_path() {
+        if let Some(base_path) = krate.trimmed_base_path() {
             envs.push((
                 dioxus_cli_config::ASSET_ROOT_ENV.into(),
                 base_path.to_string(),

packages/cli/src/build/request.rs

@@ -2801,7 +2801,7 @@ impl BuildRequest {
         // If this is a release build, bake the base path and title into the binary with env vars.
         // todo: should we even be doing this? might be better being a build.rs or something else.
         if self.release {
-            if let Some(base_path) = self.base_path() {
+            if let Some(base_path) = self.trimmed_base_path() {
                 env_vars.push((ASSET_ROOT_ENV.into(), base_path.to_string().into()));
             }
             env_vars.push((
@@ -4898,7 +4898,7 @@ __wbg_init({{module_or_path: "/{}/{wasm_path}"}}).then((wasm) => {{
 
         // Add the base path to the head if this is a debug build
         if self.is_dev_build() {
-            if let Some(base_path) = &self.base_path() {
+            if let Some(base_path) = &self.trimmed_base_path() {
                 head_resources.push_str(&format_base_path_meta_element(base_path));
             }
         }
@@ -5044,14 +5044,16 @@ __wbg_init({{module_or_path: "/{}/{wasm_path}"}}).then((wasm) => {{
             .filter(|_| matches!(self.bundle, BundleFormat::Web | BundleFormat::Server))
     }
 
-    /// Get the normalized base path for the application with `/` trimmed from both ends. If the base path is not set, this will return `.`.
+    /// Get the normalized base path for the application with `/` trimmed from both ends.
+    pub(crate) fn trimmed_base_path(&self) -> Option<&str> {
+        self.base_path()
+            .map(|p| p.trim_matches('/'))
+            .filter(|p| !p.is_empty())
+    }
+
+    /// Get the trimmed base path or `.` if no base path is set
     pub(crate) fn base_path_or_default(&self) -> &str {
-        let trimmed_path = self.base_path().unwrap_or_default().trim_matches('/');
+        self.trimmed_base_path().unwrap_or(".")
-        if trimmed_path.is_empty() {
-            "."
-        } else {
-            trimmed_path
-        }
     }
 
     /// Get the path to the package manifest directory