feat(Wind): Add Language, Tree, and Model IPC channels

Extend the IPC channel registry in Channel.ts with new command constants required for editor UI interactions. Introduce channels for Language features (`ProvideInlineCompletions`), Tree View management (`GetChildren`, `Reveal`, `SelectionChanged`, `CollapseElement`, `ExpandElement`, `VisibilityChanged`), and Model updates (`UpdateContent`).

Simultaneously, correct a stub implementation in TauriMainProcessService.ts. The `createWorker` entry in `utilityProcessWorker` was incorrectly wrapped in an object, causing a silent hang in `DiskFileSystemProvider` when the workbench awaited a non-thenable value. Refactor it to return a direct `Promise` to match the lockstep copy in the Output component.

These changes align the IPC layer with upcoming workbench service implementations and resolve a critical blocking issue in the worker lifecycle.

Author: NikolaRHristov

Source/IPC/Channel.ts

@@ -424,6 +424,25 @@ export default {
 
 	GitIsAvailable: "git:isAvailable",
 
+	// --- Language features ---
+	LanguageProvideInlineCompletions: "language:provideInlineCompletions",
+
+	// --- Tree view ---
+	TreeGetChildren: "tree:getChildren",
+
+	TreeReveal: "tree:reveal",
+
+	TreeSelectionChanged: "tree:selectionChanged",
+
+	TreeCollapseElement: "tree:collapseElement",
+
+	TreeExpandElement: "tree:expandElement",
+
+	TreeVisibilityChanged: "tree:visibilityChanged",
+
+	// --- Model ---
+	ModelUpdateContent: "model:updateContent",
+
 	// --- SCM ---
 	ScmCreateSourceControl: "scm:createSourceControl",
 

Source/Service/TauriMainProcessService.ts

@@ -233,7 +233,11 @@ const StubChannels: Record<string, Record<string, unknown>> = {
 	sharedProcess: {},
 
 	utilityProcessWorker: {
-		createWorker: { onDidTerminate: new Promise(() => {}) },
+		// createWorker must be a Promise (not an object wrapping one).
+		// The workbench calls .then() directly on the return value; wrapping
+		// in { onDidTerminate } made it a non-thenable causing a silent hang
+		// in DiskFileSystemProvider. Matches Output's lockstep copy.
+		createWorker: new Promise(() => {}),
 
 		disposeWorker: undefined,
 	},