feat(frontend): add a terminal theme and three-way theme switcher

Adds the cyber theme to the console and login page, replaces the dark/light toggle with a theme switcher, and moves the login page script to /login.js so it is served under the existing CSP.

packages/api/public/login.js

@@ -0,0 +1,112 @@
+(() => {
+    const root = document.documentElement;
+    const buttons = document.querySelectorAll('.tg button');
+    const reducedMotion = matchMedia('(prefers-reduced-motion: reduce)').matches;
+
+    function setTheme(theme) {
+        root.setAttribute('data-theme', theme);
+        try {
+            localStorage.setItem('thecloud-theme', theme);
+        } catch (ignored) {
+            // Theme persistence is optional when browser storage is unavailable.
+        }
+        buttons.forEach((button) => button.classList.toggle('on', button.dataset.t === theme));
+    }
+
+    let initialTheme = matchMedia('(prefers-color-scheme: light)').matches ? 'light' : 'dark';
+    try {
+        const savedTheme = localStorage.getItem('thecloud-theme');
+        if (savedTheme === 'dark' || savedTheme === 'light' || savedTheme === 'cyber') {
+            initialTheme = savedTheme;
+        }
+    } catch (ignored) {
+        // The OS preference remains the fallback when browser storage is unavailable.
+    }
+    setTheme(initialTheme);
+
+    buttons.forEach((button) => button.addEventListener('click', () => setTheme(button.dataset.t)));
+    document.addEventListener('keydown', (event) => {
+        if ((event.key === 't' || event.key === 'T') && !event.metaKey && !event.ctrlKey && !event.altKey && !/INPUT|TEXTAREA/.test(event.target.tagName)) {
+            const themes = ['dark', 'light', 'cyber'];
+            setTheme(themes[(themes.indexOf(root.getAttribute('data-theme')) + 1) % themes.length]);
+        }
+    });
+
+    const lines = ['hello, engineer.', 'aws s3 mb s3://my-bucket', 'your own AWS, on your own hardware.', 'sfn start-execution --local', 'welcome to TheCloud.'];
+    const typewriter = document.getElementById('tw');
+    let line = 0;
+    let count = 0;
+    let deleting = false;
+    if (reducedMotion) {
+        typewriter.textContent = lines[2];
+    } else {
+        function type() {
+            const word = lines[line];
+            if (deleting) {
+                count--;
+                typewriter.textContent = word.slice(0, count);
+                if (count === 0) {
+                    deleting = false;
+                    line = (line + 1) % lines.length;
+                    setTimeout(type, 400);
+                    return;
+                }
+                setTimeout(type, 35);
+                return;
+            }
+            count++;
+            typewriter.textContent = word.slice(0, count);
+            if (count === word.length) {
+                deleting = true;
+                setTimeout(type, 2200);
+                return;
+            }
+            setTimeout(type, 75 + Math.random() * 50);
+        }
+        type();
+    }
+
+    const hero = document.getElementById('top');
+    const glow = document.getElementById('grid-glow');
+    if (!reducedMotion) {
+        hero.addEventListener('mousemove', (event) => {
+            const rect = hero.getBoundingClientRect();
+            glow.style.left = `${event.clientX - rect.left}px`;
+            glow.style.top = `${event.clientY - rect.top}px`;
+            glow.style.opacity = '1';
+        });
+        hero.addEventListener('mouseleave', () => {
+            glow.style.opacity = '0';
+        });
+    }
+
+    const progress = document.getElementById('bar');
+    addEventListener('scroll', () => {
+        const height = document.documentElement.scrollHeight - innerHeight;
+        progress.style.width = `${height > 0 ? scrollY / height * 100 : 0}%`;
+    }, {passive: true});
+
+    const form = document.querySelector('[data-sso-form]');
+    if (form) {
+        form.addEventListener('submit', () => {
+            const button = form.querySelector('.btn');
+            button.classList.add('is-loading');
+            button.disabled = true;
+            document.getElementById('label').textContent = 'Redirecting...';
+        });
+    }
+
+    const copy = document.getElementById('cp');
+    if (copy) {
+        copy.addEventListener('click', () => {
+            navigator.clipboard.writeText(document.getElementById('code').innerText).then(() => {
+                copy.textContent = 'copied';
+                copy.classList.add('ok');
+                setTimeout(() => {
+                    copy.textContent = 'copy';
+                    copy.classList.remove('ok');
+                }, 1800);
+            });
+        });
+    }
+})();