fix(viewer): gouttiere de numeros de ligne synchronisee au scroll en mode pretty print

frontend/style.css

@@ -2054,43 +2054,48 @@ select {
 
 /* --- Pretty print (mode lecture fichiers texte non-markdown) --- */
 .pretty-view {
-  display: flex;
+  position: relative;
+  display: grid;
+  grid-template-columns: auto 1fr;
+  align-items: stretch;
   background: var(--code-bg);
   border: 1px solid var(--border);
   border-radius: 8px;
-  overflow: hidden;
+  overflow: auto;
   max-height: 78vh;
 }
 .pretty-view .pp-gutter {
-  flex: 0 0 auto;
+  position: sticky; /* figee au scroll horizontal, suit le scroll vertical */
+  left: 0;
+  z-index: 2;
   display: flex;
   flex-direction: column;
   padding: 16px 10px 16px 14px;
   text-align: right;
   font-family: "JetBrains Mono", monospace;
-  font-size: 0.8rem;
+  font-size: 0.85rem;
   line-height: 1.55;
   color: var(--text-muted);
   opacity: 0.65;
   user-select: none;
   background: var(--bg-secondary);
   border-right: 1px solid var(--border);
-  overflow: hidden;
+  box-sizing: border-box;
 }
 .pretty-view .pp-pre {
-  flex: 1 1 auto;
   margin: 0 !important;
   border: none !important;
   border-radius: 0 !important;
   background: transparent !important;
   padding: 16px !important;
-  overflow: auto;
+  overflow: visible;
 }
 .pretty-view .pp-pre code {
   font-family: "JetBrains Mono", monospace;
   font-size: 0.85rem;
   line-height: 1.55;
   white-space: pre;
+  display: block;
 }
 /* Niveaux de log colorises par le fallback pretty-print (pas d'equivalent hljs) */
 .pretty-view .pp-level {