Report and retry Docker resources remove_project could not delete

remove_project_volumes always returned Ok(()) regardless of what actually
happened, making the `if let Err(e)` guarding it at every call site dead
code. remove_project then dropped the project record unconditionally, so a
volume, image or container that failed to delete became permanently
unreachable — confirmed against a real orphaned volume pair found in the
wild (fixes #31).

remove_project_volumes/remove_snapshot_image/remove_container now report
what they could not remove (treating "already gone" as success rather than
a leftover), remove_project surfaces this to the user via a toast, and
before dropping the project record it writes a pending-cleanup record that
startup housekeeping retries automatically on the next launch.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FGjXq6fqtAFHdbhk4f3PfZ

app/src/components/projects/home/ProjectHome.tsx

@@ -1,5 +1,6 @@
 import { useEffect, useMemo, useState } from "react";
 import { useShallow } from "zustand/react/shallow";
+import type { ProjectRemovalReport } from "../../../lib/types";
 import { useAppState } from "../../../store/appState";
 import { useProjectActions } from "../../../hooks/useProjectActions";
 import { useProjects } from "../../../hooks/useProjects";
@@ -30,6 +31,16 @@ const TABS = [
 
 export type ProjectHomeTabId = (typeof TABS)[number]["id"];
 
+/** Names what a `ProjectRemovalReport` says survived, for the leftover toast. */
+function describeLeftovers(report: ProjectRemovalReport): string {
+  const parts: string[] = [];
+  if (report.container) parts.push("its container");
+  if (report.image) parts.push("its saved image");
+  if (report.volumes.length === 1) parts.push("a volume");
+  else if (report.volumes.length > 1) parts.push(`${report.volumes.length} volumes`);
+  return parts.join(", ");
+}
+
 interface Props {
   projectId: string;
   active: boolean;
@@ -282,7 +293,14 @@ export default function ProjectHome({ projectId, active }: Props) {
           onConfirm={async () => {
             setConfirmRemove(false);
             try {
-              await remove(project.id);
+              const report = await remove(project.id);
+              if (report.container || report.image || report.volumes.length > 0) {
+                useAppState.getState().pushToast({
+                  kind: "info",
+                  message: `“${project.name}” was removed, but some Docker resources are still on disk`,
+                  detail: `Triple-C will retry removing ${describeLeftovers(report)} the next time it starts.`,
+                });
+              }
             } catch (e) {
               useAppState.getState().pushToast({
                 kind: "error",

app/src/hooks/useProjects.ts

@@ -44,8 +44,9 @@ export function useProjects() {
 
   const remove = useCallback(
     async (id: string) => {
-      await commands.removeProject(id);
+      const report = await commands.removeProject(id);
       removeProjectFromList(id);
+      return report;
     },
     [removeProjectFromList],
   );

app/src/lib/tauri-commands.ts

@@ -1,5 +1,5 @@
 import { invoke } from "@tauri-apps/api/core";
-import type { Project, ProjectPath, ContainerInfo, AppSettings, UpdateInfo, ImageUpdateInfo, FileEntry, FileContents, WebTerminalInfo, SttStatus, GatewayStatus, InstallOptions, ClaudeSession, ContainerCapabilities, ScheduledTask, ScheduledTaskInput, SchedulerNotification, AuthBridgeStatus, BrowserViewStatus, BrowserViewPopoutState, BrowserPageState, PlaywrightDetection, BrowserSetupOutcome, BrowserInstallTarget, ContainerStaleness, MigrationOptions, MigrationReport, MigrationState, ClearTokenOutcome, CaCertInfo, UploadOutcome } from "./types";
+import type { Project, ProjectPath, ProjectRemovalReport, ContainerInfo, AppSettings, UpdateInfo, ImageUpdateInfo, FileEntry, FileContents, WebTerminalInfo, SttStatus, GatewayStatus, InstallOptions, ClaudeSession, ContainerCapabilities, ScheduledTask, ScheduledTaskInput, SchedulerNotification, AuthBridgeStatus, BrowserViewStatus, BrowserViewPopoutState, BrowserPageState, PlaywrightDetection, BrowserSetupOutcome, BrowserInstallTarget, ContainerStaleness, MigrationOptions, MigrationReport, MigrationState, ClearTokenOutcome, CaCertInfo, UploadOutcome } from "./types";
 
 // Docker
 export const checkDocker = () => invoke<boolean>("check_docker");
@@ -13,7 +13,7 @@ export const listProjects = () => invoke<Project[]>("list_projects");
 export const addProject = (name: string, paths: ProjectPath[]) =>
   invoke<Project>("add_project", { name, paths });
 export const removeProject = (projectId: string) =>
-  invoke<void>("remove_project", { projectId });
+  invoke<ProjectRemovalReport>("remove_project", { projectId });
 export const updateProject = (project: Project) =>
   invoke<Project>("update_project", { project });
 export const startProjectContainer = (projectId: string) =>

app/src/lib/types.ts

@@ -77,6 +77,15 @@ export type ProjectStatus =
   | "stopping"
   | "error";
 
+/** What `removeProject` could not delete. The project is removed from the
+ *  sidebar either way; anything named here is recorded on the host and
+ *  retried automatically the next time the app starts. */
+export interface ProjectRemovalReport {
+  container: string | null;
+  image: string | null;
+  volumes: string[];
+}
+
 export type Backend =
   | "anthropic"
   | "bedrock"