Show plain interrupted when no leftover tool remains

After tools drain, currentToolName is null. Claiming "tools still
running" lied to the operator. Name a leftover tool while one is
present; otherwise just say interrupted. Also satisfy prettier on
the lifecycleStatus union.

Author: TheGreatAxios

src/tui/agent-progress.test.ts

@@ -49,6 +49,24 @@ describe("agentProgress", () => {
     expect(progress?.stalled).toBe(false);
   });
 
+  test("an interrupted session with no leftover tool shows plain interrupted", () => {
+    const progress = agentProgress(
+      {
+        ...base,
+        lifecycleStatus: "interrupted",
+        currentToolName: null,
+        currentToolPreview: null,
+        currentToolStartedAt: null,
+        lastActivityAt: 1_000,
+      },
+      91_000,
+    );
+    expect(progress?.stat).toBe("interrupted");
+    expect(progress?.stat).not.toContain("still running");
+    expect(progress?.working).toBe(false);
+    expect(progress?.stalled).toBe(false);
+  });
+
   test("a running session reports elapsed time and its current tool", () => {
     const progress = agentProgress({ ...base, lastActivityAt: 42_000 }, 42_000);
     expect(progress).toEqual({

src/tui/agent-progress.ts

@@ -18,12 +18,7 @@ export interface AgentProgressSession {
   readonly status: "running" | "done" | "failed" | "cancelled";
   /** Present when the strip knows lifecycle independently of TUI status. */
   readonly lifecycleStatus?:
-    | "pending_init"
-    | "running"
-    | "interrupted"
-    | "completed"
-    | "shutdown"
-    | "not_found";
+    "pending_init" | "running" | "interrupted" | "completed" | "shutdown" | "not_found";
   readonly currentToolName: string | null;
   /**
    * Bounded subject of the oldest outstanding call (command, path, pattern…),
@@ -156,9 +151,7 @@ export function agentProgress(
 
   if (session.lifecycleStatus === "interrupted") {
     const toolBit =
-      hasSubject && session.currentToolName !== null
-        ? ` · ${subject} still running`
-        : " · tools still running";
+      hasSubject && session.currentToolName !== null ? ` · ${subject} still running` : "";
     return {
       stat: `interrupted${toolBit}`,
       state,