test(mobile): model the real re-show ordering in the streaming-gate tests

The overlay regression test replayed the transcript before the stream text on
the way back from the terminal view. That ordering is backwards: the session
withholds `messages` until a fresh read settles (an RPC round trip) while the
throttled stream text returns in ~50ms — and with the transcript already back,
a gate that got discarded on the toggle still passes. Replay the real order,
which pins the gate's lifetime as intended.

Swaps the hidden-gap duplicate case for the in-view one (a tool frame clears
the assistant text mid-turn), which is where the hold actually earns its keep;
the hidden-gap direction stays covered at the gate level.

mobile/src/session/MobileNativeChatOverlay.test.ts

@@ -136,19 +136,25 @@ describe('MobileNativeChatOverlay streaming gate', () => {
 
     await update({ show: false, messages: [], streamLive: true })
     expect(streaming()).toBe('hidden')
-    // Back on chat: the throttled status trails the first re-render by a tick.
-    await update({ messages: prior, streamLive: true })
+    // Back on chat the session withholds its transcript until a fresh read
+    // settles, so the throttled stream text returns a round trip ahead of it.
+    await update({ messages: [], streamLive: true })
+    await update({ messages: [], streamingText: 'Done.', streamLive: true })
     await update({ messages: prior, streamingText: 'Done.', streamLive: true })
 
     expect(streaming()).toBe('Done.')
   })
 
-  it('still hides the bubble when the reply landed while chat was hidden', async () => {
+  it('hides a repeated part whose own turn landed during a mid-turn gap', async () => {
+    // Between parts the status frame carries no assistant text (a tool call), so
+    // the stream goes textless while the turn is still live and the part that
+    // just finished lands in the transcript. Re-anchoring on that tick would
+    // adopt it as history and render it a second time.
     const prior = [assistantTurn('a1', 'Done.')]
     await render({ messages: prior })
     await update({ messages: prior, streamingText: 'Done.', streamLive: true })
+    expect(streaming()).toBe('Done.')
 
-    await update({ show: false, messages: [], streamLive: true })
     const landed = [...prior, assistantTurn('a2', 'Done.')]
     await update({ messages: landed, streamLive: true })
     await update({ messages: landed, streamingText: 'Done.', streamLive: true })

mobile/src/session/mobile-native-chat-streaming-gate.test.ts

@@ -81,15 +81,17 @@ describe('deriveMobileNativeChatStreaming', () => {
 
   it('keeps the segment baseline through textless ticks while the turn is live', () => {
     // Chat is hidden mid-stream: the transcript unsubscribes and the status
-    // stops reaching the gate, but the turn has not ended.
+    // stops reaching the gate, but the turn has not ended. Coming back, the
+    // stream text returns before the re-read transcript does.
     const prior = [assistant('a1', 'Done.')]
     const { results } = run([
       { folded: prior },
       { folded: prior, text: 'Done.', live: true },
       { folded: [], live: true },
+      { folded: [], text: 'Done.', live: true },
       { folded: prior, text: 'Done.', live: true }
     ])
-    expect(results).toEqual([null, 'Done.', null, 'Done.'])
+    expect(results).toEqual([null, 'Done.', null, 'Done.', 'Done.'])
   })
 
   it('still hides after a hidden gap once the reply landed as its own turn', () => {