fix(vscode): replace Show Changes with diff stats badge, shorten Worktree label

Replace the "Show Changes" text button with a compact diff stats badge
showing file count, additions, and deletions (3f +42 -8) using data
from session.summary(). Shorten "Continue in Worktree" to "Worktree".
All three buttons share one row.

packages/kilo-vscode/webview-ui/src/components/chat/ChatView.tsx

@@ -151,15 +151,18 @@ export const ChatView: Component<ChatViewProps> = (props) => {
                   {language.t("command.session.new.task")}
                 </Button>
                 <Show when={isSidebar()}>
-                  <Button
-                    variant="ghost"
-                    size="small"
+                  <button
+                    class="session-diff-badge"
                     onClick={() => vscode.postMessage({ type: "openChanges" })}
                     aria-label={language.t("command.session.show.changes")}
                   >
-                    <Icon name="file-tree" size="small" />
-                    {language.t("command.session.show.changes")}
-                  </Button>
+                    <Icon name="layers" size="small" />
+                    <Show when={session.summary()?.files} fallback={<span>0f</span>}>
+                      <span class="session-diff-files">{session.summary()!.files}f</span>
+                      <span class="session-diff-add">+{session.summary()!.additions}</span>
+                      <span class="session-diff-del">-{session.summary()!.deletions}</span>
+                    </Show>
+                  </button>
                 </Show>
                 <Show when={canContinueInWorktree()}>
                   <Button
@@ -178,7 +181,7 @@ export const ChatView: Component<ChatViewProps> = (props) => {
                     <Show when={transferring()} fallback={<Icon name="branch" size="small" />}>
                       <Spinner class="chat-spinner-small" />
                     </Show>
-                    {transferring() ? transferDetail() : "Continue in Worktree"}
+                    {transferring() ? transferDetail() : "Worktree"}
                   </Button>
                 </Show>
               </div>

packages/kilo-vscode/webview-ui/src/styles/chat.css

@@ -180,13 +180,53 @@
   display: flex;
   flex-wrap: wrap;
   gap: 4px;
+  align-items: center;
 }
 
-.session-actions-row > [data-component="button"] {
+.session-actions-row > [data-component="button"],
+.session-actions-row > .session-diff-badge {
   flex: 1 1 0;
   min-width: fit-content;
 }
 
+/* Diff stats badge — matches Agent Manager diff toggle style */
+.session-diff-badge {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  gap: 4px;
+  padding: 4px 8px;
+  border: none;
+  border-radius: 4px;
+  background: transparent;
+  color: var(--vscode-descriptionForeground);
+  font-family: var(--vscode-editor-font-family), monospace;
+  font-size: 11px;
+  font-variant-numeric: tabular-nums;
+  cursor: pointer;
+  white-space: nowrap;
+}
+
+.session-diff-badge:hover {
+  background: var(--vscode-toolbar-hoverBackground);
+}
+
+.session-diff-badge [data-component="icon"] {
+  opacity: 0.7;
+}
+
+.session-diff-files {
+  color: var(--vscode-descriptionForeground);
+}
+
+.session-diff-add {
+  color: #34d399;
+}
+
+.session-diff-del {
+  color: #f87171;
+}
+
 /* ============================================
    Message List
    ============================================ */