sheets: reorder by dragging instead of up/down buttons

Move-up/move-down felt disconnected from the result — clicking a
button and having two rows silently swap position doesn't read as
motion. Dropped both buttons for native HTML5 drag-and-drop: drag a
sheet, an accent line shows where it'll land, drop to reorder. Still
respects the pinned/unpinned grouping — dragging across that boundary
is a no-op, same as the old up/down buttons.

src/i18n.ts

@@ -61,8 +61,6 @@ const dict: Record<string, Record<string, string>> = {
     cancel: "Cancel",
     pin: "Pin",
     unpin: "Unpin",
-    moveUp: "Move up",
-    moveDown: "Move down",
     marketUpdated: "Market data updated",
     exportImage: "Copy as image",
     imageCopied: "Image copied",
@@ -139,8 +137,6 @@ const dict: Record<string, Record<string, string>> = {
     cancel: "Отмена",
     pin: "Закрепить",
     unpin: "Открепить",
-    moveUp: "Выше",
-    moveDown: "Ниже",
     marketUpdated: "Рыночные данные обновлены",
     exportImage: "Скопировать картинкой",
     imageCopied: "Картинка скопирована",

src/main.ts

@@ -81,24 +81,28 @@ function pinDoc(id: string): void {
   renderDocList();
 }
 
-function moveDoc(id: string, dir: -1 | 1): void {
-  const idx = data.docs.findIndex((d) => d.id === id);
-  if (idx < 0) return;
-  const doc = data.docs[idx];
-  const target = data.docs[idx + dir];
-  if (!target || !!target.pinned !== !!doc.pinned) return; // can't cross pin boundary
-  data.docs.splice(idx, 1);
-  data.docs.splice(idx + dir, 0, doc);
+/** drag id -> drop-target id; no-op across the pinned/unpinned boundary */
+function reorderDoc(srcId: string, targetId: string): void {
+  if (srcId === targetId) return;
+  const src = data.docs.find((d) => d.id === srcId);
+  const target = data.docs.find((d) => d.id === targetId);
+  if (!src || !target || !!src.pinned !== !!target.pinned) return;
+  data.docs = data.docs.filter((d) => d.id !== srcId);
+  const targetIdx = data.docs.findIndex((d) => d.id === targetId);
+  data.docs.splice(targetIdx, 0, src);
   saveAppData(data);
   renderDocList();
 }
 
+let dragSrcId: string | null = null;
+
 function renderDocList(): void {
   const list = $("#doc-list");
   list.replaceChildren();
   for (const doc of data.docs) {
     const el = document.createElement("div");
     el.className = "doc-item" + (doc.id === data.activeId ? " active" : "") + (doc.pinned ? " pinned" : "");
+    el.draggable = true;
     const name = document.createElement("span");
     name.className = "doc-name";
     name.textContent = doc.title || t("untitled");
@@ -114,8 +118,31 @@ function renderDocList(): void {
     };
 
     el.appendChild(mkBtn("pin-btn" + (doc.pinned ? " active" : ""), "📌", doc.pinned ? t("unpin") : t("pin"), () => pinDoc(doc.id)));
-    el.appendChild(mkBtn("move-btn", "↑", t("moveUp"), () => moveDoc(doc.id, -1)));
-    el.appendChild(mkBtn("move-btn", "↓", t("moveDown"), () => moveDoc(doc.id, 1)));
+
+    el.addEventListener("dragstart", (e) => {
+      dragSrcId = doc.id;
+      el.classList.add("dragging");
+      e.dataTransfer!.effectAllowed = "move";
+      e.dataTransfer?.setData("text/plain", doc.id);
+    });
+    el.addEventListener("dragend", () => {
+      el.classList.remove("dragging");
+      dragSrcId = null;
+      for (const other of list.querySelectorAll(".doc-item")) other.classList.remove("drag-over");
+    });
+    el.addEventListener("dragover", (e) => {
+      if (!dragSrcId || dragSrcId === doc.id) return;
+      const src = data.docs.find((d) => d.id === dragSrcId);
+      if (!src || !!src.pinned !== !!doc.pinned) return; // can't cross the pin boundary
+      e.preventDefault(); // allow drop
+      for (const other of list.querySelectorAll(".doc-item")) other.classList.remove("drag-over");
+      el.classList.add("drag-over");
+    });
+    el.addEventListener("drop", (e) => {
+      e.preventDefault();
+      el.classList.remove("drag-over");
+      if (dragSrcId) reorderDoc(dragSrcId, doc.id);
+    });
 
     const del = document.createElement("button");
     del.className = "del";

src/ui/app.css

@@ -102,7 +102,7 @@ body {
 .doc-item {
   padding: 7px 10px;
   border-radius: 6px;
-  cursor: pointer;
+  cursor: grab;
   font-size: 13px;
   white-space: nowrap;
   overflow: hidden;
@@ -110,12 +110,15 @@ body {
   display: flex;
   align-items: center;
   gap: 6px;
+  border-top: 2px solid transparent;
+  transition: background-color 0.15s ease, color 0.15s ease, opacity 0.15s ease, border-top-color 0.15s ease;
 }
 .doc-item:hover { background: var(--hover); }
 .doc-item.active { background: var(--sel); }
+.doc-item.dragging { opacity: 0.4; }
+.doc-item.drag-over { border-top-color: var(--accent); }
 .doc-name { flex: 1; overflow: hidden; text-overflow: ellipsis; }
 .doc-item .pin-btn,
-.doc-item .move-btn,
 .doc-item .del {
   flex-shrink: 0;
   opacity: 0;
@@ -130,7 +133,6 @@ body {
   transition: opacity 0.15s ease, background-color 0.15s ease;
 }
 .doc-item:hover .pin-btn,
-.doc-item:hover .move-btn,
 .doc-item:hover .del { opacity: 0.7; }
 .doc-item .pin-btn.active { opacity: 1; }
 .doc-item:hover .pin-btn.active { opacity: 1; }