Restructure frontend code to allow for extensions (#4721)

# Description of Changes
Move frontend code into `core` folder and add infrastructure for
`proprietary` folder to include premium, non-OSS features

frontend/src/proprietary/components/shared/DividerWithText.tsx

@@ -0,0 +1,36 @@
+import '@app/components/shared/dividerWithText/DividerWithText.css';
+
+interface TextDividerProps {
+  text?: string
+  className?: string
+  style?: React.CSSProperties
+  variant?: 'default' | 'subcategory'
+  respondsToDarkMode?: boolean
+  opacity?: number
+}
+
+export default function DividerWithText({ text, className = '', style, variant = 'default', respondsToDarkMode = true, opacity }: TextDividerProps) {
+  const variantClass = variant === 'subcategory' ? 'subcategory' : '';
+  const themeClass = respondsToDarkMode ? '' : 'force-light';
+  const styleWithOpacity = opacity !== undefined ? { ...(style || {}), ['--text-divider-opacity' as any]: opacity } : style;
+
+  if (text) {
+    return (
+      <div
+        className={`text-divider ${variantClass} ${themeClass} ${className}`}
+        style={styleWithOpacity}
+      >
+        <div className="text-divider__rule" />
+        <span className="text-divider__label">{text}</span>
+        <div className="text-divider__rule" />
+      </div>
+    );
+  }
+
+  return (
+    <div
+      className={`h-px my-2.5 ${themeClass} ${className}`}
+      style={styleWithOpacity}
+    />
+  );
+}

frontend/src/proprietary/components/shared/LoginRightCarousel.tsx

@@ -0,0 +1,159 @@
+import { useEffect, useMemo, useRef, useState } from 'react';
+import { BASE_PATH } from '@app/constants/app';
+
+type ImageSlide = { src: string; alt?: string; cornerModelUrl?: string; title?: string; subtitle?: string; followMouseTilt?: boolean; tiltMaxDeg?: number }
+
+export default function LoginRightCarousel({
+  imageSlides = [],
+  showBackground = true,
+  initialSeconds = 5,
+  slideSeconds = 8,
+}: {
+  imageSlides?: ImageSlide[]
+  showBackground?: boolean
+  initialSeconds?: number
+  slideSeconds?: number
+}) {
+  const totalSlides = imageSlides.length;
+  const [index, setIndex] = useState(0);
+  const mouse = useRef({ x: 0, y: 0 });
+
+  const durationsMs = useMemo(() => {
+    if (imageSlides.length === 0) return [];
+    return imageSlides.map((_, i) => (i === 0 ? (initialSeconds ?? slideSeconds) : slideSeconds) * 1000);
+  }, [imageSlides, initialSeconds, slideSeconds]);
+
+  useEffect(() => {
+    if (totalSlides <= 1) return;
+    const timeout = setTimeout(() => {
+      setIndex((i) => (i + 1) % totalSlides);
+    }, durationsMs[index] ?? slideSeconds * 1000);
+    return () => clearTimeout(timeout);
+  }, [index, totalSlides, durationsMs, slideSeconds]);
+
+  useEffect(() => {
+    const onMove = (e: MouseEvent) => {
+      mouse.current.x = (e.clientX / window.innerWidth) * 2 - 1;
+      mouse.current.y = (e.clientY / window.innerHeight) * 2 - 1;
+    };
+    window.addEventListener('mousemove', onMove);
+    return () => window.removeEventListener('mousemove', onMove);
+  }, []);
+
+  function TiltImage({ src, alt, enabled, maxDeg = 6 }: { src: string; alt?: string; enabled: boolean; maxDeg?: number }) {
+    const imgRef = useRef<HTMLImageElement | null>(null);
+
+    useEffect(() => {
+      const el = imgRef.current;
+      if (!el) return;
+
+      let raf = 0;
+      const tick = () => {
+        if (enabled) {
+          const rotY = (mouse.current.x || 0) * maxDeg;
+          const rotX = -(mouse.current.y || 0) * maxDeg;
+          el.style.transform = `translateY(-2rem) rotateX(${rotX.toFixed(2)}deg) rotateY(${rotY.toFixed(2)}deg)`;
+        } else {
+          el.style.transform = 'translateY(-2rem)';
+        }
+        raf = requestAnimationFrame(tick);
+      };
+      raf = requestAnimationFrame(tick);
+      return () => cancelAnimationFrame(raf);
+    }, [enabled, maxDeg]);
+
+    return (
+      <img
+        ref={imgRef}
+        src={src}
+        alt={alt ?? 'Carousel slide'}
+        style={{
+          maxWidth: '86%',
+          maxHeight: '78%',
+          objectFit: 'contain',
+          borderRadius: '18px',
+          background: 'transparent',
+          transform: 'translateY(-2rem)',
+          transition: 'transform 80ms ease-out',
+          willChange: 'transform',
+          transformOrigin: '50% 50%',
+        }}
+      />
+    );
+  }
+
+  return (
+    <div style={{ position: 'relative', overflow: 'hidden', width: '100%', height: '100%' }}>
+      {showBackground && (
+        <img
+          src={`${BASE_PATH}/Login/LoginBackgroundPanel.png`}
+          alt="Background panel"
+          style={{ position: 'absolute', inset: 0, width: '100%', height: '100%', objectFit: 'cover' }}
+        />
+      )}
+
+      {/* Image slides */}
+      {imageSlides.map((s, idx) => (
+        <div
+          key={s.src}
+          style={{
+            position: 'absolute',
+            inset: 0,
+            display: 'flex',
+            alignItems: 'center',
+            justifyContent: 'center',
+            transition: 'opacity 600ms ease',
+            opacity: index === idx ? 1 : 0,
+            perspective: '900px',
+          }}
+        >
+          {(s.title || s.subtitle) && (
+            <div style={{ position: 'absolute', bottom: 24 + 32, left: 0, right: 0, textAlign: 'center', padding: '0 2rem', width: '100%' }}>
+              {s.title && (
+                <div style={{ fontSize: 20, fontWeight: 800, color: '#ffffff', textShadow: '0 2px 6px rgba(0,0,0,0.25)', marginBottom: 6 }}>{s.title}</div>
+              )}
+              {s.subtitle && (
+                <div style={{ fontSize: 13, color: 'rgba(255,255,255,0.92)', textShadow: '0 1px 4px rgba(0,0,0,0.25)' }}>{s.subtitle}</div>
+              )}
+            </div>
+          )}
+          <TiltImage src={s.src} alt={s.alt} enabled={index === idx && !!s.followMouseTilt} maxDeg={s.tiltMaxDeg ?? 6} />
+
+        </div>
+      ))}
+
+      {/* Dot navigation */}
+      <div
+        style={{
+          position: 'absolute',
+          bottom: 16,
+          left: 0,
+          right: 0,
+          display: 'flex',
+          justifyContent: 'center',
+          gap: 10,
+          zIndex: 2,
+        }}
+      >
+        {Array.from({ length: totalSlides }).map((_, i) => (
+          <button
+            key={i}
+            aria-label={`Go to slide ${i + 1}`}
+            onClick={() => setIndex(i)}
+            style={{
+              width: '10px',
+              height: '12px',
+              borderRadius: '50%',
+              border: 'none',
+              cursor: 'pointer',
+              backgroundColor: i === index ? '#ffffff' : 'rgba(255,255,255,0.5)',
+              boxShadow: '0 2px 6px rgba(0,0,0,0.25)',
+              display: 'block',
+              flexShrink: 0,
+            }}
+          />
+        ))}
+      </div>
+    </div>
+  );
+}

frontend/src/proprietary/components/shared/config/OverviewHeader.tsx

@@ -0,0 +1,42 @@
+import { Text, Button } from '@mantine/core';
+import { useTranslation } from 'react-i18next';
+import { useAuth } from '@app/auth/UseSession';
+import { useNavigate } from 'react-router-dom';
+
+export function OverviewHeader() {
+  const { t } = useTranslation();
+  const { signOut, user } = useAuth();
+  const navigate = useNavigate();
+
+  const handleLogout = async () => {
+    try {
+      await signOut();
+      navigate('/login');
+    } catch (error) {
+      console.error('Logout error:', error);
+    }
+  };
+
+  return (
+    <div>
+      <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: '0.5rem' }}>
+        <div>
+          <Text fw={600} size="lg">{t('config.overview.title', 'Application Configuration')}</Text>
+          <Text size="sm" c="dimmed">
+            {t('config.overview.description', 'Current application settings and configuration details.')}
+          </Text>
+          {user?.email && (
+            <Text size="xs" c="dimmed" mt="0.25rem">
+              Signed in as: {user.email}
+            </Text>
+          )}
+        </div>
+        {user && (
+          <Button color="red" variant="filled" onClick={handleLogout}>
+            Log out
+          </Button>
+        )}
+      </div>
+    </div>
+  );
+}

frontend/src/proprietary/components/shared/dividerWithText/DividerWithText.css

@@ -0,0 +1,52 @@
+
+.text-divider {
+  display: flex;
+  align-items: center;
+  gap: 0.75rem; /* 12px */
+  margin-top: 0.375rem; /* 6px */
+  margin-bottom: 0.5rem; /* 8px */
+}
+
+.text-divider .text-divider__rule {
+  height: 0.0625rem; /* 1px */
+  flex: 1 1 0%;
+  background-color: rgb(var(--text-divider-rule-rgb, var(--gray-200)) / var(--text-divider-opacity, 1));
+}
+
+.text-divider .text-divider__label {
+  color: rgb(var(--text-divider-label-rgb, var(--gray-400)) / var(--text-divider-opacity, 1));
+  font-size: 0.75rem; /* 12px */
+  white-space: nowrap;
+}
+
+.text-divider.subcategory {
+  margin-top: 0;
+  margin-bottom: 0;
+}
+
+.text-divider.subcategory .text-divider__rule {
+  background-color: var(--tool-subcategory-rule-color);
+}
+
+.text-divider.subcategory .text-divider__label {
+  color: var(--tool-subcategory-text-color);
+  text-transform: uppercase;
+  font-weight: 600;
+}
+
+/* Force light theme colors regardless of dark mode */
+.text-divider.force-light .text-divider__rule {
+  background-color: rgb(var(--text-divider-rule-rgb-light, var(--gray-200)) / var(--text-divider-opacity, 1));
+}
+
+.text-divider.force-light .text-divider__label {
+  color: rgb(var(--text-divider-label-rgb-light, var(--gray-400)) / var(--text-divider-opacity, 1));
+}
+
+.text-divider.subcategory.force-light .text-divider__rule {
+  background-color: var(--tool-subcategory-rule-color-light);
+}
+
+.text-divider.subcategory.force-light .text-divider__label {
+  color: var(--tool-subcategory-text-color-light);
+}

frontend/src/proprietary/components/shared/loginSlides.ts

@@ -0,0 +1,43 @@
+import { BASE_PATH } from '@app/constants/app';
+
+export type LoginCarouselSlide = {
+  src: string
+  alt?: string
+  title?: string
+  subtitle?: string
+  cornerModelUrl?: string
+  followMouseTilt?: boolean
+  tiltMaxDeg?: number
+}
+
+export const loginSlides: LoginCarouselSlide[] = [
+  {
+    src: `${BASE_PATH}/Login/Firstpage.png`,
+    alt: 'Stirling PDF overview',
+    title: 'Your one-stop-shop for all your PDF needs.',
+    subtitle:
+      'A privacy-first cloud suite for PDFs that lets you convert, sign, redact, and manage documents, along with 50+ other powerful tools.',
+    followMouseTilt: true,
+    tiltMaxDeg: 5,
+  },
+  {
+    src: `${BASE_PATH}/Login/AddToPDF.png`,
+    alt: 'Edit PDFs',
+    title: 'Edit PDFs to display/secure the information you want',
+    subtitle:
+      'With over a dozen tools to help you redact, sign, read and manipulate PDFs, you will be sure to find what you are looking for.',
+    followMouseTilt: true,
+    tiltMaxDeg: 5,
+  },
+  {
+    src: `${BASE_PATH}/Login/SecurePDF.png`,
+    alt: 'Secure PDFs',
+    title: 'Protect sensitive information in your PDFs',
+    subtitle:
+      'Add passwords, redact content, and manage certificates with ease.',
+    followMouseTilt: true,
+    tiltMaxDeg: 5,
+  },
+];
+
+export default loginSlides;