Add multiple selectable themes

[Copilot]

Adds a theme selector with four visual themes: Airport Dashboard (default), Windows 95, Chalkboard, and Old School Notebook. Theme selection persists via localStorage.

Changes

• context/ThemeContext.tsx - React context for theme state with localStorage persistence
• components/ThemeSelector.tsx - Dropdown for theme selection
• components/DashboardHeader.tsx - Client component wrapping header + theme selector
• globals.css - CSS variables per theme, theme-specific style overrides
• layout.tsx - Wrapped with ThemeProvider
• page.tsx - Uses new DashboardHeader component

Usage

import { useTheme } from "@/context/ThemeContext";

const { theme, setTheme } = useTheme();
setTheme("windows95"); // "airport" | "windows95" | "chalkboard" | "notebook"

Screenshots

Airport Dashboard	Windows 95

Chalkboard	Old School Notebook

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• 127.0.0.11
  • Triggering command: REDACTED, pid is -1 (packet block)
• dev-yasm.prodyna.com
  • Triggering command: /otelcol-contrib /otelcol-contrib --config /etc/otelcol-contrib/config.yaml (dns block)
  • Triggering command: /otelcol-contrib /otelcol-contrib --config /etc/otelcol-contrib/config.yaml k/_temp/copilot-developer-action/var/run/docker/runtime-runc/moby (dns block)
  • Triggering command: /otelcol-contrib /otelcol-contrib --config /etc/otelcol-contrib/config.yaml a4b/log.json 31cd�� --version (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Multiple selectable themes</issue_title>
<issue_description>I would like to have the theme selectable. The following themes should exist:

• The current airport departure dashboard
• Windows 95
• Chalkboard
• Old school notebook</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Multiple selectable themes #49

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