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openspec/changes/archive/2026-02-13-p06-theming/specs/theme-switcher-control/spec.md

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+## ADDED Requirements
+
+### Requirement: Header provides icon-based theme switcher
+The system SHALL display a theme switcher in the top-right header area with icon controls for system, light, dark, and high-contrast modes.
+
+#### Scenario: Theme options visible as icons
+- **WHEN** a user views the header
+- **THEN** all four theme options are represented by distinct icons
+- **AND** each option is keyboard-accessible and screen-reader labeled
+
+#### Scenario: Theme selection applies immediately
+- **WHEN** a user selects a theme option
+- **THEN** the page updates visual theme without full page reload
+- **AND** selected option has a visible active state