Feat: Livres blancs — nouveau template collection + livre blanc individuel

- Blueprints white-papers / white-paper (intro, cover, PDF, date)
- Templates PHP + JSON API (liste avec singleSlug, détail avec fileUrl)
- Route POST (:any)/(:any)/download pour le téléchargement gated
- Panel : entrée white-papers ajoutée au menu après blog
- collection.css : styles partagés extraits de Blog (collection-*)
- Blog.svelte : classes renommées blog-* → collection-*
- WhitePapers.svelte : vue liste, URLs dynamiques via data.uri
- WhitePaper.svelte : vue détail deux colonnes + formulaire de téléchargement
- i18n : clés white paper (label, form, consentement, statuts)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/styles/collection.css

@@ -0,0 +1,180 @@
+/* Shared styles for collection pages (Blog, WhitePapers) */
+
+/* --- Header / Intro --- */
+.collection-header {
+  text-align: center;
+  padding: 6rem 0 3rem;
+  max-width: 40rem;
+  margin: auto;
+}
+
+.collection-header h1 {
+  font-size: var(--font-size-title-main);
+  text-transform: uppercase;
+  margin-bottom: 2rem;
+}
+
+.collection-header p {
+  font-size: var(--font-size-subtitle);
+  font-weight: 400;
+}
+
+.collection-header :global(h1) {
+  font-family: "Terminal", sans-serif;
+  font-size: var(--font-size-title-main);
+  text-transform: uppercase;
+  margin-bottom: 1.5rem;
+}
+
+.collection-header :global(p) {
+  font-size: var(--font-size-subtitle);
+  line-height: 1.6;
+  max-width: 640px;
+  margin: 0 auto;
+  opacity: 0.9;
+}
+
+/* --- Card --- */
+.collection-card {
+  display: flex;
+  justify-content: space-between;
+  align-items: flex-start;
+  gap: 2rem;
+  padding: 1.5rem 0;
+}
+
+.collection-card-text {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  gap: 1rem;
+  max-width: 640px;
+}
+
+.collection-card-date {
+  color: #d9d9d9;
+  font-size: var(--font-size-paragraph);
+}
+
+.collection-card-title {
+  font-family: "Danzza", sans-serif;
+  font-size: 40px;
+  max-width: 80%;
+  font-weight: 700;
+}
+
+.collection-card-title a {
+  transition: color 0.2s;
+}
+
+.collection-card-title a:hover {
+  color: var(--color-primary);
+}
+
+.collection-card-description {
+  color: #d9d9d9;
+  font-family: "Danzza", sans-serif;
+  font-size: var(--font-size-paragraph);
+  font-weight: 400;
+}
+
+.collection-card-readmore {
+  color: var(--color-primary);
+  font-family: "Danzza", sans-serif;
+  font-size: var(--font-size-paragraph);
+  font-weight: 500;
+  text-transform: uppercase;
+}
+
+.collection-card-readmore .arrow {
+  margin-left: 5px;
+}
+
+/* --- Image --- */
+.collection-card-image img {
+  width: 300px;
+  height: 169px;
+  object-fit: cover;
+  transition: transform 0.3s;
+}
+
+.collection-card-image img:hover {
+  transform: scale(1.05);
+}
+
+.collection-card-image--featured img {
+  width: auto;
+  height: 300px;
+}
+
+/* --- Divider --- */
+.collection-divider {
+  border: none;
+  border-top: 1px solid rgba(255, 255, 255, 0.15);
+  margin: 0;
+}
+
+/* --- Featured --- */
+.collection-card--featured .collection-card-title {
+  font-size: 36px;
+  line-height: 1.3;
+}
+
+/* --- Loading --- */
+.collection-loading {
+  text-align: center;
+  padding: 4rem 0;
+  opacity: 0.6;
+}
+
+/* --- Mobile --- */
+@media (max-width: 700px) {
+  .collection-header {
+    padding: 4rem 0 2rem;
+  }
+
+  .collection-header :global(h1) {
+    font-size: var(--font-size-title-main-mobile);
+  }
+
+  .collection-header :global(p) {
+    font-size: var(--font-size-subtitle-mobile);
+  }
+
+  .collection-card {
+    flex-direction: column;
+  }
+
+  .collection-card-image img,
+  .collection-card-image--featured img {
+    width: 100%;
+    height: auto;
+    aspect-ratio: 16/9;
+  }
+
+  .collection-card--featured .collection-card-title {
+    font-size: var(--font-size-title-section-mobile);
+  }
+
+  .collection-card-title {
+    font-size: var(--font-size-title-section-mobile);
+  }
+}
+
+/* --- Tablet --- */
+@media (min-width: 701px) and (max-width: 912px) {
+  .collection-header :global(h1) {
+    font-size: var(--font-size-title-main-tablet);
+  }
+
+  .collection-card {
+    flex-direction: column;
+  }
+
+  .collection-card-image img,
+  .collection-card-image--featured img {
+    width: 100%;
+    height: auto;
+    aspect-ratio: 16/9;
+  }
+}

src/styles/fonts.css

@@ -65,3 +65,7 @@
   background-clip: text;
   -webkit-background-clip: text;
 }
+
+.pixel {
+  font-family: "Terminal", sans-serif;
+}

src/styles/index.css

@@ -3,6 +3,7 @@
 @import './reset.css';
 @import './fonts.css';
 @import './layout.css';
+@import './collection.css';
 @import './buttons.css';
 @import './cursor.css';
 @import './utils.css';