style: show creation timestamps on all recent chat sidebar entries

Display timestamps on all chat entries in Today and Yesterday groups
for consistent visual rhythm, not just on duplicate-label entries.

Author: marian2js

apps/desktop/src/app/shell/AppSidebar.tsx

@@ -397,7 +397,7 @@ export function AppSidebar({
                                   markActionSession(session.id); // backfill localStorage
                                 }
                                 const label = formatSessionLabel(session);
-                                const timestamp = duplicateLabels.has(baseLabel(label))
+                                const timestamp = (isRecent || duplicateLabels.has(baseLabel(label)))
                                   ? formatShortTime(session.createdAt)
                                   : undefined;
                                 return (

test/ui/chat-sidebar-uniform-timestamps.test.ts

@@ -0,0 +1,43 @@
+import { describe, expect, it } from "vitest";
+import { readFileSync } from "node:fs";
+import { resolve } from "node:path";
+
+const sidebarSrc = readFileSync(
+  resolve(__dirname, "../../apps/desktop/src/app/shell/AppSidebar.tsx"),
+  "utf-8",
+);
+
+describe("Chat sidebar – uniform timestamps", () => {
+  // AC1 & AC2: All chat entries in "Today" and "Yesterday" groups show creation timestamps
+  it("shows timestamps for recent entries (Today/Yesterday) regardless of duplicates", () => {
+    // The timestamp assignment should include isRecent as a condition
+    // so entries in Today/Yesterday always get a timestamp
+    expect(sidebarSrc).toMatch(/isRecent\s*\|\|\s*duplicateLabels\.has/);
+  });
+
+  // AC3: Entries in older date groups show timestamps only for duplicate labels
+  it("preserves duplicate-only timestamp logic for older groups via duplicateLabels.has", () => {
+    // duplicateLabels.has should still be present (not removed)
+    expect(sidebarSrc).toContain("duplicateLabels.has(baseLabel(label))");
+  });
+
+  // AC4: Timestamps use the existing formatShortTime format
+  it("uses formatShortTime for timestamp value", () => {
+    // The timestamp value is derived from formatShortTime(session.createdAt)
+    expect(sidebarSrc).toContain("formatShortTime(session.createdAt)");
+  });
+
+  // AC5: Timestamp styling uses the existing muted style
+  it("renders timestamps with muted sidebar-foreground/40 styling", () => {
+    expect(sidebarSrc).toContain("text-sidebar-foreground/40");
+    // timestamp rendering should include the dot separator
+    expect(sidebarSrc).toMatch(/·\s*\{timestamp\}/);
+  });
+
+  // AC6: isRecent is defined based on Today/Yesterday group labels
+  it("defines isRecent from Today and Yesterday group labels", () => {
+    expect(sidebarSrc).toMatch(
+      /isRecent\s*=\s*group\.label\s*===\s*["']Today["']\s*\|\|\s*group\.label\s*===\s*["']Yesterday["']/,
+    );
+  });
+});