Refine split terminal tour copy

Co-authored-by: Orca <help@stably.ai>

src/shared/contextual-tours.test.ts

@@ -46,7 +46,7 @@ describe('contextual tour definitions', () => {
     // Two steps only: tasks and orchestration education lives in their own
     // page tours, so the in-app tour ends after the worktree CTA.
     expect(tour?.steps.map((step) => step.title)).toEqual([
-      'Work side by side',
+      'Split a terminal pane',
       'Run another task in parallel'
     ])
     // The opening step teaches the split gesture and offers the convenience button.

src/shared/contextual-tours.ts

@@ -73,8 +73,8 @@ export const CONTEXTUAL_TOURS = [
     id: 'workspace-agent-sessions',
     steps: [
       {
-        title: 'Work side by side',
-        body: 'Run more than one thread of work at once. Open a second terminal pane with {terminal.splitRight}, or right-click the pane for split options.',
+        title: 'Split a terminal pane',
+        body: 'Open a second terminal pane with {terminal.splitRight}, or right-click the pane for split options.',
         targetSelector:
           '[data-contextual-tour-target="terminal-pane-split-target"], [data-contextual-tour-target="workspace-agent-terminal-tip"]',
         requiredForStart: true,