Add priorities for editables (#3133)

## Summary

We weren't setting a priority for editables, so they were being visited
last.

I think there's still a problem whereby we're not aggressive enough in
visiting recursive extras (and, in fact, that's making it really hard to
write a test -- I wrote a test, but the most-reduced case still fails,
and I'd need to add a layer of indirection to make it
fail-on-main-but-pass-on-this-branch), but that problem likely already
existed on main prior to #3087, so I just want to get this quick fix out
now.

Closes https://github.com/astral-sh/uv/issues/3127.

## Test Plan

- `git clone https://github.com/cda-tum/mqt-core.git`
- `cargo run venv`
- `cargo run pip install 'scikit-build-core[pyproject]>=0.8.1'
'setuptools_scm>=7' 'pybind11>=2.12' --resolution=lowest-direct`
- `cargo run pip install --no-build-isolation
'-ve.[test,qiskit,evaluation,coverage]' --resolution=lowest-direct`

crates/uv-resolver/src/resolver/mod.rs

@@ -831,10 +831,17 @@ impl<
 
                 // Add a dependency on each editable.
                 for (editable, metadata) in self.editables.iter() {
-                    constraints.push(
-                        PubGrubPackage::from_package(metadata.name.clone(), None, &self.urls),
-                        Range::singleton(metadata.version.clone()),
-                    );
+                    let package =
+                        PubGrubPackage::from_package(metadata.name.clone(), None, &self.urls);
+                    let version = Range::singleton(metadata.version.clone());
+
+                    // Update the package priorities.
+                    priorities.insert(&package, &version);
+
+                    // Add the editable as a direct dependency.
+                    constraints.push(package, version);
+
+                    // Add a dependency on each extra.
                     for extra in &editable.extras {
                         constraints.push(
                             PubGrubPackage::from_package(
@@ -891,7 +898,7 @@ impl<
                     )?;
 
                     for (dep_package, dep_version) in constraints.iter() {
-                        debug!("Adding transitive dependency for {package}{version}: {dep_package}{dep_version}");
+                        debug!("Adding transitive dependency for {package}=={version}: {dep_package}{dep_version}");
 
                         // Update the package priorities.
                         priorities.insert(dep_package, dep_version);
@@ -999,14 +1006,14 @@ impl<
                     self.markers,
                 )?;
 
-                for (package, version) in constraints.iter() {
-                    debug!("Adding transitive dependency: {package}{version}");
+                for (dep_package, dep_version) in constraints.iter() {
+                    debug!("Adding transitive dependency for {package}=={version}: {dep_package}{dep_version}");
 
                     // Update the package priorities.
-                    priorities.insert(package, version);
+                    priorities.insert(dep_package, dep_version);
 
                     // Emit a request to fetch the metadata for this package.
-                    self.visit_package(package, request_sink).await?;
+                    self.visit_package(dep_package, request_sink).await?;
                 }
 
                 Ok(Dependencies::Available(constraints.into()))