treewide: replace std hashers with rustc_hash alternatives; fix clippy

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I766c36cb53d3d7f9e85b91a67c4131a66a6a6964

crates/pinakes-plugin-api/tests/integration.rs

@@ -3,8 +3,6 @@
 //! Renderer-level behaviour (e.g., Dioxus components) is out of scope here;
 //! that requires a Dioxus runtime and belongs in pinakes-ui tests.
 
-use std::collections::HashMap;
-
 use pinakes_plugin_api::{
   DataSource,
   HttpMethod,
@@ -26,8 +24,8 @@ fn make_page(id: &str, route: &str) -> UiPage {
       gap:      0,
       padding:  None,
     },
-    data_sources: HashMap::new(),
-    actions:      HashMap::new(),
+    data_sources: Default::default(),
+    actions:      Default::default(),
   }
 }