fix: filebrowser scroll+lang hover+black-flash+shell one-line

- filebrowser: select() only scrollIntoView on keyboard, not hover
- lang-switch: .lang-switch:hover → invert rule (header excluded before)
- black-flash: color-scheme light; dark script sets colorScheme
- shell: flex-wrap nowrap; keepEnd() scrolls on input

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

assets/css/custom.css

@@ -10,10 +10,15 @@
 .prompt {
   font-family: var(--font-family-mono);
   display: flex;
-  flex-wrap: wrap;
+  /* stay on ONE line: when the command gets too wide, clip the left (older)
+     part terminal-style and keep the caret/right end visible (shell.js scrolls
+     it to the end). previously flex-wrap:wrap dropped to a 2nd line and bugged. */
+  flex-wrap: nowrap;
   align-items: flex-start;
   gap: 0;
   line-height: 1.5;
+  overflow: hidden;
+  white-space: nowrap;
 }
 .prompt__user { font-weight: 700; }
 .prompt__path { color: var(--color-text-muted); }
@@ -299,9 +304,11 @@ body {
   user-select: text;
 }
 
-/* dotted content + footer links: unchanged at rest, invert to black on hover */
+/* dotted content + footer links: unchanged at rest, invert to black on hover.
+   include the header language switch so en/de behave like every other link. */
 main a:hover,
-footer a:hover {
+footer a:hover,
+.lang-switch:hover {
   background: var(--color-text-primary);
   color: var(--color-bg-primary);
   border-bottom-color: transparent;

assets/js/filebrowser.js

@@ -31,7 +31,7 @@
     if (img.complete) img.style.opacity = "1";   // already cached → no fade
   }
 
-  function select(i, silent) {
+  function select(i, silent, scroll) {
     if (!rows.length) return;
     if (i < 0) i = 0;
     if (i >= rows.length) i = rows.length - 1;
@@ -39,7 +39,9 @@
     for (var r = 0; r < rows.length; r++) rows[r].classList.remove("is-selected");
     var a = rows[i];
     a.classList.add("is-selected");
-    if (a.scrollIntoView) a.scrollIntoView({ block: "nearest" });
+    // only scroll for keyboard nav — scrolling on hover nudges edge rows out from
+    // under the cursor, so the top/bottom row "sometimes" can't be clicked.
+    if (scroll && a.scrollIntoView) a.scrollIntoView({ block: "nearest" });
 
     var src = a.getAttribute("data-img");
     var tkey = a.getAttribute("data-text");
@@ -100,8 +102,8 @@
     var t = e.target;
     if (t && (t.isContentEditable || /^(input|textarea|select)$/i.test(t.tagName))) return;
     if (!rows.length) return;
-    if (e.key === "ArrowDown") { e.preventDefault(); select(cur + 1); }
-    else if (e.key === "ArrowUp") { e.preventDefault(); select(cur - 1); }
+    if (e.key === "ArrowDown") { e.preventDefault(); select(cur + 1, false, true); }
+    else if (e.key === "ArrowUp") { e.preventDefault(); select(cur - 1, false, true); }
     else if (e.key === "Enter") {
       var href = rows[cur] && rows[cur].getAttribute("href");
       if (href) { if (window.pjax) window.pjax(href); else window.location.href = href; }

assets/js/shell.js

@@ -8,8 +8,13 @@
   var input = document.querySelector(".prompt__input");
   var out = document.querySelector(".prompt__out");
   var menu = document.querySelector(".menu");
+  var promptEl = document.querySelector(".prompt");
   if (!bar || !input) return;
 
+  // keep the caret/right end in view: when the line overflows, scroll it fully
+  // right so the left (older) part clips off terminal-style instead of wrapping.
+  function keepEnd() { if (promptEl) promptEl.scrollLeft = promptEl.scrollWidth; }
+
   var home = bar.getAttribute("data-home") || "/";
 
   // command → url: the always-open menu, plus any context routes (e.g. the
@@ -307,7 +312,7 @@
       caretToEnd(); say("");
     }
   });
-  input.addEventListener("input", function () { say(""); });
+  input.addEventListener("input", function () { say(""); keepEnd(); });
 
   function caretToEnd() {
     var r = document.createRange();
@@ -316,6 +321,7 @@
     var s = window.getSelection();
     s.removeAllRanges();
     s.addRange(r);
+    keepEnd();
   }
 
   // start typing anywhere → the keystroke goes straight into the command line