feat(cargo): dependency version inspections and updates (#684)

Cargo.toml had no way to tell that a dependency had a newer release.

Dependencies in [dependencies], [dev-dependencies], [build-dependencies], target tables and [workspace.dependencies] now get a weak warning when the newest stable release is outside the version requirement, with a quick fix that rewrites the requirement at its original precision ("0.7" → "0.10") in both string and inline-table forms. Versions complete inside the version string, newest first, without yanked releases. Path, git and workspace-inherited dependencies are skipped, prereleases are only suggested to prerelease requirements, and failures stay silent.

Versions come from the crates.io sparse index through the backend's HTTP client, with an in-memory and on-disk cache and coalesced requests, behind a dependency version source shared by file-type parsers so other manifests can be added later. semver is now used directly; it was already linked into the app.

Fixes #479

src-tauri/src/commands/dependencies.rs

@@ -0,0 +1,17 @@
+//! Typed IPC adapters for manifest dependency versions.
+use crate::state::AppState;
+use ide_core::{DocId, IdeResult, RequestId};
+use ide_workspace::dependencies::DependencyVersions;
+use tauri::{State, Window};
+
+#[tauri::command]
+#[specta::specta]
+pub async fn dependency_versions(
+    window: Window,
+    state: State<'_, AppState>,
+    doc: DocId,
+    offset: Option<u32>,
+    request: RequestId,
+) -> IdeResult<Vec<DependencyVersions>> {
+    ide_host::ops::dependencies::dependency_versions(&state.host, window.label(), doc, offset, request).await
+}

src-tauri/src/commands/mod.rs

@@ -16,6 +16,7 @@ pub mod clipboard;
 pub mod coverage;
 pub mod db;
 pub mod debug;
+pub mod dependencies;
 pub mod deploy;
 pub mod doc;
 pub mod docker;
@@ -190,6 +191,7 @@ pub fn builder() -> tauri_specta::Builder<tauri::Wry> {
         nav::fs_resolve_reference,
         nav::path_completions,
         nav::web_unresolved_references,
+        dependencies::dependency_versions,
         spell::spell_check,
         spell::spell_suggest,
         search::search_start,