Enhance calendar duty display and tooltip functionality

- Updated the calendar rendering to use a duty marker with improved accessibility attributes for duty names and titles.
- Introduced a new function `bindDutyMarkerTooltips` to display tooltips with duty names on hover over duty markers.
- Enhanced CSS styles for duty markers to improve visibility and user interaction.
- Ensured tooltips are dynamically positioned and hidden appropriately to enhance user experience.

webapp/app.js

@@ -204,9 +204,11 @@
 
       const cell = document.createElement("div");
       cell.className = "day" + (isOther ? " other-month" : "") + (isToday ? " today" : "") + (dayDuties.length ? " has-duty" : "") + (hasEvent ? " holiday" : "");
+      const dutyNamesAttr = dayDuties.length ? escapeHtml(dayDuties.map(function (x) { return x.full_name; }).join("\n")) : "";
+      const dutyTitleAttr = dayDuties.length ? escapeHtml(dayDuties.map(function (x) { return x.full_name; }).join(", ")) : "";
       cell.innerHTML =
         "<span class=\"num\">" + d.getDate() + "</span>" +
-        (dayDuties.length ? "<span class=\"day-duties\">" + dayDuties.map(function (x) { return escapeHtml(x.full_name); }).join(", ") + "</span>" : "") +
+        (dayDuties.length ? "<span class=\"duty-marker\" data-duty-names=\"" + dutyNamesAttr + "\" title=\"" + dutyTitleAttr + "\" aria-label=\"Дежурные\">Д</span>" : "") +
         (hasEvent ? "<button type=\"button\" class=\"info-btn\" aria-label=\"Информация о дне\" data-summary=\"" + escapeHtml(eventSummaries.join("\n")) + "\">i</button>" : "");
       calendarEl.appendChild(cell);
       d.setDate(d.getDate() + 1);
@@ -214,6 +216,7 @@
 
     monthTitleEl.textContent = MONTHS[month] + " " + year;
     bindInfoButtonTooltips();
+    bindDutyMarkerTooltips();
   }
 
   function positionHint(hintEl, btnRect) {
@@ -298,6 +301,38 @@
     }
   }
 
+  function bindDutyMarkerTooltips() {
+    var hintEl = document.getElementById("dutyMarkerHint");
+    if (!hintEl) {
+      hintEl = document.createElement("div");
+      hintEl.id = "dutyMarkerHint";
+      hintEl.className = "calendar-event-hint";
+      hintEl.setAttribute("role", "tooltip");
+      hintEl.hidden = true;
+      document.body.appendChild(hintEl);
+    }
+    var hideTimeout = null;
+    calendarEl.querySelectorAll(".duty-marker").forEach(function (marker) {
+      marker.addEventListener("mouseenter", function () {
+        if (hideTimeout) {
+          clearTimeout(hideTimeout);
+          hideTimeout = null;
+        }
+        var names = marker.getAttribute("data-duty-names") || "";
+        hintEl.textContent = names;
+        var rect = marker.getBoundingClientRect();
+        positionHint(hintEl, rect);
+        hintEl.hidden = false;
+      });
+      marker.addEventListener("mouseleave", function () {
+        hideTimeout = setTimeout(function () {
+          hintEl.hidden = true;
+          hideTimeout = null;
+        }, 150);
+      });
+    });
+  }
+
   function renderDutyList(duties) {
     if (duties.length === 0) {
       dutyListEl.innerHTML = "<p class=\"muted\">В этом месяце дежурств нет.</p>";

webapp/style.css

@@ -90,6 +90,9 @@ body {
   border-radius: 8px;
   font-size: 0.85rem;
   background: var(--surface);
+  min-width: 0;
+  min-height: 0;
+  overflow: hidden;
 }
 
 .day.other-month {
@@ -161,14 +164,19 @@ body {
   transform: none;
 }
 
-.day-duties {
+.duty-marker {
-  font-size: 0.6rem;
+  display: inline-flex;
-  color: var(--duty);
+  align-items: center;
+  justify-content: center;
+  width: 16px;
+  height: 16px;
   margin-top: 2px;
-  max-width: 100%;
+  font-size: 0.65rem;
-  overflow: hidden;
+  font-weight: 700;
-  text-overflow: ellipsis;
+  color: var(--duty);
-  white-space: nowrap;
+  background: rgba(158, 206, 106, 0.25);
+  border-radius: 50%;
+  flex-shrink: 0;
 }
 
 .duty-list {