// Dark-mode theme helper (T34b). Plain browser global in the treeview-storage.js
// style (no ES-module export) so the App.razor <head> pre-hydration inline
// script and this file agree on one localStorage key and one apply rule.
//
//   * get()    — reads the persisted choice ('dark' only when explicitly stored;
//                anything else is 'light').
//   * apply()  — sets data-bs-theme on <html>; the site.css [data-bs-theme="dark"]
//                token-override block (T34a) does the rest, side-rail included.
//   * set()    — persists + applies, returns the mode.
//   * toggle() — flips and persists, returns the new mode (the DarkModeToggle
//                component's click path).
//
// Every localStorage touch is wrapped in try/catch so private-browsing modes
// (which throw on access) degrade to light rather than break the page.
window.sbTheme = {
    KEY: 'sb-theme',
    get() {
        try { return localStorage.getItem(this.KEY) === 'dark' ? 'dark' : 'light'; }
        catch { return 'light'; }
    },
    apply(mode) {
        document.documentElement.setAttribute('data-bs-theme', mode);
    },
    set(mode) {
        try { localStorage.setItem(this.KEY, mode); } catch { }
        this.apply(mode);
        return mode;
    },
    toggle() {
        return this.set(this.get() === 'dark' ? 'light' : 'dark');
    }
};
