archive: add-dark-light-mode change complete

openspec/changes/add-dark-light-mode/proposal.md

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-## Why
-
-The application currently uses a fixed hacker theme with a dark background. Users may prefer a light theme for better visibility in bright environments or to match their system preferences. Adding dark/light mode with system theme detection and manual override provides flexibility and improves accessibility.
-
-## What Changes
-
-- Add system theme detection that automatically applies dark or light mode based on the user's OS/browser preference
-- Add a manual theme toggle control that allows users to override the system preference
-- Persist the user's theme preference in localStorage so it survives page refreshes
-- Update the hacker theme implementation to support both light and dark variants while maintaining the monospace, neon-accent aesthetic
-- Ensure all UI components (sidebar, chart, buttons, inputs, modals) adapt correctly to both themes
-
-## Capabilities
-
-### New Capabilities
-- `theme-switching`: System for detecting OS theme preference, providing manual theme toggle, and persisting user preference across sessions
-
-### Modified Capabilities
-- `hacker-theme`: Extend existing hacker theme to support both dark and light color variants while preserving monospace typography, neon accents, and terminal aesthetic
-- `ui-shell`: Add theme toggle control to the UI layout
-
-## Impact
-
-- **Frontend**: New theme provider/context in Next.js app, updated Tailwind config with light mode colors, theme toggle component
-- **CSS**: Extended color palette in globals.css and tailwind.config.ts for light mode variants
-- **Components**: All components must support both themes (sidebar, chart canvas, toolbox, modals, inputs)
-- **Dependencies**: May require next-themes or similar library for robust theme management
-- **User preferences**: localStorage usage for theme persistence