fix(settings): restore last-used workspace mode after async hydration

[tatoalo]

Problem

when you create a cloud task, then quit and relaunch PostHog Code, the new-task tab defaults back to local instead of the workspace mode you last used. The "debug logs for cloud runs" toggle in advanced settings was reported as not surviving restarts either. this was a recent regression, the bug is purely in how the value is read on mount.

[github-actions]

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_{Reviewed by React Doctor for commit 498f2d9.}

[greptile-apps]

Prompt To Fix All With AI

Fix the following 1 code review issue. Work through them one at a time, proposing concise fixes.

---

### Issue 1 of 1
packages/ui/src/features/settings/settingsStore.test.ts:79-111
The two new rehydration tests are structurally identical — both mock a persisted value, pre-set the opposite value in state, call `persist.rehydrate()`, then assert the stored value was adopted. They should be collapsed into a single parameterised test, consistent with the team's preference. The `_hasHydrated` test is distinct enough to stay separate.

```suggestion
  it.each([
    ["lastUsedWorkspaceMode", "local", "cloud"],
    ["debugLogsCloudRuns", false, true],
  ] as const)(
    "rehydrates %s",
    async (field, initial, persisted) => {
      getItem.mockResolvedValue(
        JSON.stringify({ state: { [field]: persisted }, version: 0 }),
      );

      useSettingsStore.setState({ [field]: initial });

      await useSettingsStore.persist.rehydrate();

      expect(useSettingsStore.getState()[field]).toBe(persisted);
    },
  );
```

_{Reviews (1): Last reviewed commit: "fix(settings): restore last-used workspa..." | Re-trigger Greptile}

[github-actions]

Clean, low-risk fix for async hydration race: adds a runtime-only _hasHydrated flag (excluded from partialize, so not persisted) and defers workspace mode restoration in TaskInput until after the persist middleware rehydrates. Bot review comment about parameterized tests was addressed.

[greptile-apps]

_{Reviews (2): Last reviewed commit: "fix(settings): restore last-used workspa..." | Re-trigger Greptile}