feat(desktop): unified Git operation dialog across Changes sidebar

apps/desktop/src/lib/trpc/routers/changes/git-operation-types.ts

@@ -0,0 +1,45 @@
+/**
+ * Shared types for git operation responses that carry non-fatal warnings and
+ * partial-failure classification. Frontend maps these to the unified
+ * GitOperationDialog for auto-repair notifications and sync-partial reporting.
+ */
+
+export type GitOperationWarning =
+	| {
+			kind: "auto-published-upstream";
+			/** Branch that was auto-published when a pull/sync found no upstream. */
+			branch: string;
+	  }
+	| {
+			kind: "post-push-fetch-failed";
+			/** Stderr of the failed fetch after a successful push. */
+			message: string;
+	  }
+	| {
+			kind: "push-retargeted";
+			/** Remote name the push was redirected to (usually the fork host for a PR). */
+			remote: string;
+			/** Branch name on that remote. */
+			targetBranch: string;
+	  }
+	| {
+			kind: "post-checkout-hook-failed";
+			/** Brief hook stderr. */
+			message: string;
+	  };
+
+/**
+ * Thrown by sync() so the frontend can distinguish which stage (pull or push)
+ * failed and show a tailored dialog. Message is the underlying git stderr.
+ */
+export class GitSyncStageError extends Error {
+	readonly stage: "pull" | "push";
+	readonly cause: unknown;
+	constructor(stage: "pull" | "push", cause: unknown) {
+		const message = cause instanceof Error ? cause.message : String(cause);
+		super(`[sync:${stage}] ${message}`);
+		this.name = "GitSyncStageError";
+		this.stage = stage;
+		this.cause = cause;
+	}
+}