feat(FN-4159): shrink and keep visible the github tracking enable button in

Adds a compact GitHub tracking enable button in the task detail modal header, with a fix to keep it visible during save operations and further shrinking the inline CTA styling.

Fusion-Task-Id: FN-4159

packages/dashboard/app/components/TaskDetailModal.css

@@ -439,6 +439,9 @@
 .detail-github-tracking-enable {
   margin-left: auto;
   align-self: center;
+  padding-block: calc(var(--space-xs) / 2);
+  padding-inline: var(--space-sm);
+  line-height: 1.2;
 }
 
 .detail-source-toggle {

packages/dashboard/app/components/TaskDetailModal.tsx

@@ -790,6 +790,8 @@ export function TaskDetailContent({
   const canEditGithubTracking = GITHUB_TRACKING_EDITABLE_COLUMNS.has(task.column) && !isSaving;
   const githubTrackingEnabled = githubTrackingEnabledDraft ?? (task.githubTracking?.enabled === true);
   const githubTrackedIssue = task.githubTracking?.issue;
+  const showInlineGithubTrackingEnableButton =
+    canEditGithubTracking && !githubTrackedIssue && (!githubTrackingEnabled || (isSavingGithubTracking && task.githubTracking?.enabled !== true));
   const showGithubTrackingSection = canEditGithubTracking || githubTrackingEnabled || Boolean(githubTrackedIssue);
   const githubTrackingStatus = githubTrackedIssue ? "Linked" : githubTrackingEnabled ? "Enabled" : "Disabled";
   const effectiveGithubRepoDefault = resolveEffectiveGithubRepoDefault(settings ?? null, globalSettings);
@@ -2391,15 +2393,15 @@ export function TaskDetailContent({
                     </span>
                   )}
                 </div>
-                {canEditGithubTracking && !githubTrackingEnabled && !githubTrackedIssue && !isSavingGithubTracking && (
+                {showInlineGithubTrackingEnableButton && (
                   <button
                     type="button"
-                    className="btn btn-sm btn-primary touch-target detail-github-tracking-enable"
+                    className="btn btn-sm btn-primary detail-github-tracking-enable"
                     aria-label="Enable GitHub tracking"
                     onClick={() => void handleToggleGithubTracking()}
                     disabled={isSavingGithubTracking}
                   >
-                    Enable GitHub tracking
+                    {isSavingGithubTracking ? "Saving…" : "Enable"}
                   </button>
                 )}
                 <button

packages/dashboard/app/components/__tests__/TaskDetailModal.inline-editing-and-integrations.test.tsx

@@ -2203,7 +2203,7 @@ describe("TaskDetailModal", () => {
 
       expect(screen.getByText("GitHub tracking")).toBeTruthy();
       expect(screen.getByText("Tracking is currently disabled")).toBeTruthy();
-      expect(screen.getByRole("button", { name: "Enable GitHub tracking" })).toBeInTheDocument();
+      expect(screen.getByRole("button", { name: "Enable GitHub tracking" })).toHaveTextContent("Enable");
     });
 
     it("enables GitHub tracking via the inline header button without expanding the disclosure", async () => {
@@ -2243,6 +2243,50 @@ describe("TaskDetailModal", () => {
       expect(screen.queryByRole("button", { name: "Collapse GitHub tracking details" })).toBeNull();
     });
 
+    it("keeps the inline enable button mounted and disabled while saving", async () => {
+      const { updateTask } = await import("../../api");
+      const mockUpdate = vi.mocked(updateTask);
+      let resolveUpdate: ((task: Task) => void) | undefined;
+      mockUpdate.mockImplementationOnce(
+        () =>
+          new Promise((resolve) => {
+            resolveUpdate = resolve;
+          }),
+      );
+
+      render(
+        <TaskDetailModal
+          task={makeTask({
+            id: "FN-001",
+            column: "todo",
+            githubTracking: {
+              enabled: false,
+            },
+          })}
+          onClose={noop}
+          onOpenDetail={noopOpenDetail}
+          onMoveTask={noopMove}
+          onDeleteTask={noopDelete}
+          onMergeTask={noopMerge}
+          addToast={noop}
+        />,
+      );
+
+      fireEvent.click(screen.getByRole("button", { name: "Enable GitHub tracking" }));
+
+      await waitFor(() => {
+        expect(screen.getByRole("button", { name: "Enable GitHub tracking" })).toBeDisabled();
+      });
+      expect(screen.getByRole("button", { name: "Enable GitHub tracking" })).toHaveTextContent("Saving…");
+      expect(screen.getByRole("button", { name: "Expand GitHub tracking details" })).toHaveAttribute("aria-expanded", "false");
+
+      resolveUpdate?.({ id: "FN-001" } as Task);
+
+      await waitFor(() => {
+        expect(screen.queryByRole("button", { name: "Enable GitHub tracking" })).toBeNull();
+      });
+    });
+
     it("hides the inline enable button when tracking is already enabled", () => {
       render(
         <TaskDetailModal