[E18-S04] Disable fallback #129

New Issue

2026-08-27T00:03:47Z

kpcto commented

2026-08-27 00:03:47 +00:00

Parent epic: [E18] Public theme selector (#46)

Intent

Ensure that when the owner later disables a visitor's chosen theme, the stored preference remains harmless and resolution returns the site default without error.

Acceptance criteria

A disabled chosen theme leaves the stored preference harmless.
Resolution returns the site default when the chosen theme is disabled.
The visitor receives a valid response without any error.

Explicitly out of scope

Owner theme policy settings themselves (that is E17-S03).
The mutation endpoint validation (that is E18-S02).
SSR resolution of a still-valid theme (that is E18-S03).

Test plan

Test that disabling a theme after selection returns the site default.
Assert the persisted preference is retained and not deleted.
Assert the public response renders without an error.

Rollback note

Fallback logic only; revert the commit. No data changes.

Owning stream

platform

Risk quadrant

agent-full

> Parent epic: [E18] Public theme selector (#46) ## Intent Ensure that when the owner later disables a visitor's chosen theme, the stored preference remains harmless and resolution returns the site default without error. ## Acceptance criteria - A disabled chosen theme leaves the stored preference harmless. - Resolution returns the site default when the chosen theme is disabled. - The visitor receives a valid response without any error. ## Explicitly out of scope - Owner theme policy settings themselves (that is E17-S03). - The mutation endpoint validation (that is E18-S02). - SSR resolution of a still-valid theme (that is E18-S03). ## Test plan - Test that disabling a theme after selection returns the site default. - Assert the persisted preference is retained and not deleted. - Assert the public response renders without an error. ## Rollback note - Fallback logic only; revert the commit. No data changes. ### Owning stream platform ### Risk quadrant agent-full

kpcto added this to the Sprint 5 milestone 2026-08-27 00:03:47 +00:00

kpcto added the

labels 2026-08-27 00:03:47 +00:00

kpcto referenced this issue

2026-08-27 08:05:53 +00:00

[E18-S04-T01] Disable fallback #331

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