add RustService method for sharing files via native share sheet

app/MindWork AI Studio/Tools/Services/RustService.Share.cs

@@ -0,0 +1,45 @@
+namespace AIStudio.Tools.Services;
+
+public sealed partial class RustService
+{
+    public async Task<bool> ShareFile(string filePath)
+    {
+        try
+        {
+            using var response = await this.http.PostAsJsonAsync(
+                "/share/file",
+                new ShareFileRequest(filePath),
+                this.jsonRustSerializerOptions);
+            if (!response.IsSuccessStatusCode)
+            {
+                this.logger?.LogError($"The Rust runtime rejected the share request: {response.StatusCode}.");
+                return false;
+            }
+
+            var result = await response.Content.ReadFromJsonAsync<ShareFileResponse>(this.jsonRustSerializerOptions);
+            if (result?.Success == true)
+                return true;
+
+            this.logger?.LogError($"The native share sheet could not be opened: {result?.Issue ?? "Unknown error"}");
+            return false;
+        }
+        catch (HttpRequestException exception)
+        {
+            this.logger?.LogWarning(exception, "Failed to reach the Rust runtime share endpoint.");
+            return false;
+        }
+        catch (TaskCanceledException exception)
+        {
+            this.logger?.LogWarning(exception, "Timed out while reaching the Rust runtime share endpoint.");
+            return false;
+        }
+        catch (Exception exception)
+        {
+            this.logger?.LogError(exception, "Failed to process the Rust runtime share response.");
+            return false;
+        }
+    }
+
+    private sealed record ShareFileRequest(string FilePath);
+    private sealed record ShareFileResponse(bool Success, string Issue);
+}