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openspec/specs/theme-preference-persistence/spec.md

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+## Purpose
+
+Canonical specification for theme-preference-persistence requirements synced from OpenSpec change deltas.
+
+## Requirements
+
+### Requirement: Theme choice persists across sessions
+The system SHALL persist user-selected theme with localStorage as primary storage and cookie fallback when localStorage is unavailable.
+
+#### Scenario: Persist theme in localStorage
+- **WHEN** localStorage is available and user selects a theme
+- **THEN** selected theme is saved in localStorage
+- **AND** stored value is used on next visit in same browser
+
+#### Scenario: Cookie fallback persistence
+- **WHEN** localStorage is unavailable or blocked
+- **THEN** selected theme is saved in cookie storage
+- **AND** cookie value is used to restore theme on return visit