feat: enhance UI components and error handling

- Updated HTML structure for navigation buttons in the calendar, adding SVG icons for improved visual clarity.
- Introduced a new muted text style in CSS for better presentation of empty duty list messages.
- Enhanced calendar CSS for navigation buttons and day indicators, improving layout and responsiveness.
- Improved error handling in the UI by adding retry functionality to the error display, allowing users to retry actions directly from the error message.
- Updated internationalization messages to include a retry option for error handling.
- Added unit tests to verify the new error handling behavior and UI updates.

webapp/css/base.css

@@ -89,6 +89,15 @@ body {
   padding-bottom: env(safe-area-inset-bottom, 12px);
 }
 
+/* Muted text (e.g. empty duty list message). */
+.muted {
+  color: var(--muted);
+}
+
 [data-theme="light"] .container {
   border-radius: 12px;
 }
+
+[data-theme="dark"] .container {
+  border-radius: 12px;
+}

webapp/css/calendar.css

@@ -21,7 +21,21 @@
   font-size: 24px;
   line-height: 1;
   cursor: pointer;
-  transition: opacity var(--transition-fast), transform var(--transition-fast);
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  transition: opacity var(--transition-fast), transform var(--transition-fast),
+    background-color var(--transition-fast);
+}
+
+.nav svg {
+  display: block;
+}
+
+@media (hover: hover) {
+  .nav:hover {
+    background: color-mix(in srgb, var(--accent) 15%, var(--surface));
+  }
 }
 
 .nav:focus {
@@ -48,6 +62,12 @@
   font-weight: 600;
 }
 
+@media (max-width: 480px) {
+  .title {
+    font-size: 1.25rem;
+  }
+}
+
 .weekdays {
   display: grid;
   grid-template-columns: repeat(7, 1fr);
@@ -92,13 +112,23 @@
   font-size: 0.85rem;
   background: var(--surface);
   min-width: 0;
-  min-height: 0;
+  min-height: 32px;
   overflow: hidden;
   transition: background-color var(--transition-fast), transform var(--transition-fast);
 }
 
+@media (hover: hover) {
+  .day:hover {
+    background: color-mix(in srgb, var(--accent) 10%, var(--surface));
+  }
+  .day.today:hover {
+    background: color-mix(in srgb, var(--bg) 15%, var(--today));
+  }
+}
+
 .day.other-month {
   opacity: 0.4;
+  background: color-mix(in srgb, var(--muted) 8%, var(--surface));
 }
 
 .day.today {
@@ -142,6 +172,7 @@
 .day-indicator {
   display: flex;
   justify-content: center;
+  gap: 2px;
   width: 65%;
   margin-top: 6px;
 }

webapp/css/day-detail.css

@@ -62,10 +62,10 @@ body.day-detail-sheet-open {
 .day-detail-panel--sheet::before {
   content: "";
   display: block;
-  width: 36px;
+  width: 40px;
   height: 4px;
   margin: 0 auto 8px;
-  background: var(--muted);
+  background: color-mix(in srgb, var(--muted) 80%, var(--text));
   border-radius: 2px;
 }
 
@@ -79,13 +79,19 @@ body.day-detail-sheet-open {
   border: none;
   background: transparent;
   color: var(--muted);
-  font-size: 1.5rem;
   line-height: 1;
   cursor: pointer;
   border-radius: 8px;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
   transition: opacity var(--transition-fast), background-color var(--transition-fast);
 }
 
+.day-detail-close svg {
+  display: block;
+}
+
 .day-detail-close:focus {
   outline: none;
 }

webapp/css/duty-list.css

@@ -41,7 +41,12 @@
   top: 0;
   bottom: 0;
   width: 2px;
-  background: var(--muted);
+  background: linear-gradient(
+    to bottom,
+    var(--muted) 0%,
+    var(--muted) 85%,
+    color-mix(in srgb, var(--muted) 40%, transparent) 100%
+  );
   pointer-events: none;
 }
 
@@ -185,7 +190,7 @@
 }
 
 .duty-flip-inner {
-  transition: transform 0.4s;
+  transition: transform 0.3s;
   transform-style: preserve-3d;
   position: relative;
   min-height: 0;
@@ -253,6 +258,7 @@
   border-radius: 8px;
   background: var(--surface);
   border-left: 3px solid var(--duty);
+  box-shadow: 0 1px 3px color-mix(in srgb, var(--text) 8%, transparent);
 }
 
 .duty-item--unavailable {

webapp/css/hints.css

@@ -3,7 +3,7 @@
   position: fixed;
   z-index: 1000;
   width: max-content;
-  max-width: min(98vw, 900px);
+  max-width: min(98vw, 380px);
   min-width: 0;
   padding: 8px 12px;
   background: var(--surface);

webapp/css/states.css

@@ -33,7 +33,7 @@
   }
 }
 
-.loading, .error {
+.loading {
   text-align: center;
   padding: 12px;
   color: var(--muted);
@@ -45,7 +45,16 @@
 }
 
 .error {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 12px;
+  padding: 20px 16px;
+  margin: 12px 0;
+  background: var(--surface);
+  border-radius: 12px;
   color: var(--error);
+  text-align: center;
 }
 
 .error[hidden], .loading.hidden,
@@ -53,6 +62,36 @@
   display: none !important;
 }
 
+.error-icon {
+  flex-shrink: 0;
+  color: var(--error);
+}
+
+.error-text {
+  margin: 0;
+}
+
+.error-retry {
+  margin-top: 4px;
+  padding: 8px 16px;
+  font-size: 0.9rem;
+  font-weight: 500;
+  color: var(--bg);
+  background: var(--accent);
+  border: none;
+  border-radius: 8px;
+  cursor: pointer;
+}
+
+.error-retry:hover {
+  opacity: 0.9;
+}
+
+.error-retry:focus-visible {
+  outline: 2px solid var(--accent);
+  outline-offset: 2px;
+}
+
 /* Current duty view (Mini App deep link startapp=duty) */
 [data-view="currentDuty"] .calendar-sticky,
 [data-view="currentDuty"] .duty-list {
@@ -167,11 +206,19 @@
   color: var(--muted);
   margin-bottom: 16px;
   line-height: 0;
+  width: 48px;
+  height: 48px;
+  border-radius: 50%;
+  background: color-mix(in srgb, var(--muted) 25%, transparent);
+  padding: 12px;
+  box-sizing: border-box;
 }
 
 .current-duty-no-duty-icon svg {
   display: block;
-  opacity: 0.7;
+  width: 100%;
+  height: 100%;
+  opacity: 0.85;
 }
 
 .current-duty-no-duty {
@@ -282,8 +329,12 @@
 
 .access-denied {
   text-align: center;
-  padding: 24px 12px;
+  padding: 24px 16px;
+  margin: 12px 0;
+  background: var(--surface);
+  border-radius: 12px;
   color: var(--muted);
+  box-shadow: 0 1px 3px color-mix(in srgb, var(--text) 8%, transparent);
 }
 
 .access-denied p {

webapp/index.html

@@ -3,7 +3,6 @@
 <head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
-  <link rel="icon" href="favicon.png" type="image/png">
   <title></title>
   <link rel="stylesheet" href="css/base.css">
   <link rel="stylesheet" href="css/calendar.css">
@@ -17,9 +16,13 @@
   <div class="container">
     <div class="calendar-sticky" id="calendarSticky">
       <header class="header">
-        <button type="button" class="nav" id="prevMonth" aria-label="">‹</button>
+        <button type="button" class="nav nav--prev" id="prevMonth" aria-label="">
+          <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><polyline points="15 18 9 12 15 6"/></svg>
+        </button>
         <h1 class="title" id="monthTitle"></h1>
-        <button type="button" class="nav" id="nextMonth" aria-label="">›</button>
+        <button type="button" class="nav nav--next" id="nextMonth" aria-label="">
+          <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><polyline points="9 18 15 12 9 6"/></svg>
+        </button>
       </header>
       <div class="weekdays">
         <span></span><span></span><span></span><span></span><span></span><span></span><span></span>

webapp/js/dayDetail.js

@@ -339,10 +339,14 @@ function ensurePanelInDom() {
     panelEl.hidden = true;
 
     const closeLabel = t(state.lang, "day_detail.close");
+    const closeIcon =
+      '<svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><line x1="18" y1="6" x2="6" y2="18"/><line x1="6" y1="6" x2="18" y2="18"/></svg>';
     panelEl.innerHTML =
       '<button type="button" class="day-detail-close" aria-label="' +
       escapeHtml(closeLabel) +
-      '">×</button><div class="day-detail-body"></div>';
+      '">' +
+      closeIcon +
+      '</button><div class="day-detail-body"></div>';
 
     const closeBtn = panelEl.querySelector(".day-detail-close");
     if (closeBtn) {

webapp/js/i18n.js

@@ -13,6 +13,7 @@ export const MESSAGES = {
     error_load_failed: "Load failed",
     error_network: "Could not load data. Check your connection.",
     error_generic: "Could not load data.",
+    "error.retry": "Retry",
     "nav.prev_month": "Previous month",
     "nav.next_month": "Next month",
     "weekdays.mon": "Mon",
@@ -68,6 +69,7 @@ export const MESSAGES = {
     error_load_failed: "Ошибка загрузки",
     error_network: "Не удалось загрузить данные. Проверьте интернет.",
     error_generic: "Не удалось загрузить данные.",
+    "error.retry": "Повторить",
     "nav.prev_month": "Предыдущий месяц",
     "nav.next_month": "Следующий месяц",
     "weekdays.mon": "Пн",

webapp/js/main.js

@@ -189,7 +189,7 @@ async function loadMonth() {
       }
       return;
     }
-    showError(e.message || t(state.lang, "error_generic"));
+    showError(e.message || t(state.lang, "error_generic"), loadMonth);
     setNavEnabled(true);
     return;
   }

webapp/js/ui.js

@@ -15,6 +15,7 @@ import {
   getNextBtn
 } from "./dom.js";
 import { t } from "./i18n.js";
+import { escapeHtml } from "./utils.js";
 
 /**
  * Show access-denied view and hide calendar/list/loading/error.
@@ -63,16 +64,37 @@ export function hideAccessDenied() {
   if (dutyListEl) dutyListEl.hidden = false;
 }
 
+/** Warning icon SVG for error state (24×24). */
+const ERROR_ICON_SVG =
+  '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="error-icon" aria-hidden="true"><path d="M10.29 3.86L1.82 18a2 2 0 0 0 1.71 3h16.94a2 2 0 0 0 1.71-3L13.71 3.86a2 2 0 0 0-3.42 0z"/><line x1="12" y1="9" x2="12" y2="13"/><line x1="12" y1="17" x2="12.01" y2="17"/></svg>';
+
 /**
  * Show error message and hide loading.
  * @param {string} msg - Error text
+ * @param {(() => void)|null} [onRetry] - Optional callback for Retry button
  */
-export function showError(msg) {
+export function showError(msg, onRetry) {
   const errorEl = getErrorEl();
   const loadingEl = getLoadingEl();
   if (errorEl) {
-    errorEl.textContent = msg;
+    const retryLabel = t(state.lang, "error.retry");
+    const safeMsg = typeof msg === "string" ? msg : t(state.lang, "error_generic");
+    let html =
+      ERROR_ICON_SVG +
+      '<p class="error-text">' +
+      escapeHtml(safeMsg) +
+      "</p>";
+    if (typeof onRetry === "function") {
+      html += '<button type="button" class="error-retry">' + escapeHtml(retryLabel) + "</button>";
+    }
+    errorEl.innerHTML = html;
     errorEl.hidden = false;
+    const retryBtn = errorEl.querySelector(".error-retry");
+    if (retryBtn && typeof onRetry === "function") {
+      retryBtn.addEventListener("click", () => {
+        onRetry();
+      });
+    }
   }
   if (loadingEl) loadingEl.classList.add("hidden");
 }

webapp/js/ui.test.js

@@ -93,7 +93,8 @@ describe("ui", () => {
     it("sets error text and shows error element", () => {
       showError("Network error");
       const errorEl = document.getElementById("error");
-      expect(errorEl?.textContent).toBe("Network error");
+      const textEl = errorEl?.querySelector(".error-text");
+      expect(textEl?.textContent).toBe("Network error");
       expect(errorEl?.hidden).toBe(false);
     });