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Matt Vollmer 08577006c6 fix(site): improve Workspace Autostop Fallback UX on agents settings page (#23465)
https://github.com/user-attachments/assets/a482ef45-402a-4d86-af59-b1526b2ce3e2

## Summary

Redesigns the **Default Autostop** section on the `/agents` settings
page to clarify that it is a fallback for chat-linked workspaces whose
templates do not define their own autostop policy. Template-level
settings always take priority — this is a backstop, not an override.

## Changes

### UX
- Renamed to **Workspace Autostop Fallback** with clearer description
- Replaced always-visible duration field (confusing `0` in an hours box)
with a **toggle-to-enable** pattern matching the Virtual Desktop section
- Toggle ON auto-saves with a 1-hour default; toggle OFF auto-saves with
0
- Save button is always visible when the toggle is on but disabled until
the user changes the duration value
- Per-section disabled flags — toggling autostop no longer freezes the
Virtual Desktop switch or prompt textareas during the save round-trip

### Reliability
- `onError` rollback on toggle auto-saves so the UI snaps back to server
truth on failure
- Stateful mocks in Storybook stories to prevent race conditions from
instant mock resolution

### Accessibility
- Added `aria-label="Autostop duration"` to the DurationField input
- Updated `DurationField` component to merge external `inputProps` with
internal ones (preserves `step: 1`)

### Stories
- Updated all existing autostop stories for the new toggle-based flow
- Added `DefaultAutostopToggleOff` — tests disabling from an enabled
state
- Added `DefaultAutostopSaveDisabled` — verifies Save button is visible
but disabled when no duration change

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PR generated with Coder Agents
2026-03-24 09:28:10 -04:00
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