feat(navigate): GPS-aware empty state, route info CSS refactor, user location marker on map

- Add GPS warning banner with enable-location link when GPS unavailable
- Refactor route info cards from inline styles to CSS classes
- Update empty state messaging based on GPS availability
- Show user location marker with accuracy circle on nav map when GPS available
- Hide map container when no GPS (show only empty state + search)

static/index.html

@@ -365,6 +365,73 @@
       animation: spin 0.7s linear infinite;
     }
 
+    /* ═══════════════════════════════════════════════════════════════════════
+       PULL-TO-REFRESH (mobile touch)
+       ═══════════════════════════════════════════════════════════════════════ */
+    .ptr-container {
+      overflow-y: auto;
+      -webkit-overflow-scrolling: touch;
+    }
+    .ptr-indicator {
+      display: flex; align-items: center; justify-content: center;
+      gap: 8px; height: 0; overflow: hidden;
+      transition: height 0.2s ease;
+      font-size: 13px; color: var(--text2);
+    }
+    .ptr-indicator.pulling { height: 52px; }
+    .ptr-indicator.refreshing { height: 52px; }
+    .ptr-spinner {
+      width: 20px; height: 20px; border: 2px solid var(--border);
+      border-top-color: var(--accent); border-radius: 50%;
+      transition: transform 0.2s ease;
+    }
+    .ptr-indicator.pulling .ptr-spinner { transform: rotate(0deg); }
+    .ptr-indicator.ready .ptr-spinner { transform: rotate(180deg); }
+    .ptr-indicator.refreshing .ptr-spinner {
+      animation: spin 0.7s linear infinite;
+    }
+    .ptr-icon { font-size: 18px; transition: transform 0.2s ease; }
+    .ptr-indicator.ready .ptr-icon { transform: rotate(180deg); }
+
+    /* ═══════════════════════════════════════════════════════════════════════
+       SWIPE-TO-DELETE (mobile touch)
+       ═══════════════════════════════════════════════════════════════════════ */
+    .asset-item-swipe-wrap {
+      position: relative; overflow: hidden;
+      border-bottom: 1px solid rgba(255,255,255,0.04);
+    }
+    .swipe-delete-bg {
+      position: absolute; inset: 0; display: flex; align-items: center;
+      justify-content: flex-end; padding: 0 16px;
+      background: var(--red); z-index: 0; pointer-events: none;
+      font-size: 13px; font-weight: 600; color: #fff;
+    }
+    .swipe-delete-bg span { opacity: 0; transition: opacity 0.1s; }
+    .swipe-delete-bg.revealed span { opacity: 1; }
+    .asset-item.swipeable {
+      position: relative; z-index: 1; background: var(--bg);
+      transition: transform 0.2s ease; will-change: transform;
+    }
+    .asset-item.swiped { transform: translateX(-80px); }
+    .asset-item.swipe-to-delete {
+      position: relative; z-index: 1;
+    }
+
+    /* ═══════════════════════════════════════════════════════════════════════
+       DESKTOP-ONLY REFRESH BUTTON
+       ═══════════════════════════════════════════════════════════════════════ */
+    .desktop-refresh-btn {
+      display: none; /* hidden by default, shown on non-touch */
+      margin-left: auto; padding: 6px 14px;
+      font-size: 13px; border: 1px solid var(--border);
+      border-radius: var(--radius-sm); background: var(--card);
+      color: var(--text2); cursor: pointer;
+      transition: all 0.15s;
+      -webkit-tap-highlight-color: transparent;
+    }
+    .desktop-refresh-btn:hover { background: var(--card2); color: var(--text); }
+    body.has-mouse .desktop-refresh-btn { display: inline-flex; align-items: center; gap: 6px; }
+
     /* ═══════════════════════════════════════════════════════════════════════
        EMPTY STATE
        ═══════════════════════════════════════════════════════════════════════ */
@@ -1752,6 +1819,12 @@
 
     <!-- ── List View ────────────────────────────────────────────────────── -->
     <div id="assetsListView">
+      <!-- Pull-to-refresh indicator (mobile touch) -->
+      <div class="ptr-indicator" id="ptrIndicator">
+        <div class="ptr-spinner"></div>
+        <span class="ptr-icon">↓</span>
+        <span class="ptr-label">Pull to refresh</span>
+      </div>
       <div class="search-bar">
         <input id="assetSearch" type="text" class="input-field" placeholder="Search assets..." oninput="loadAssets()">
         <button class="clear-btn" id="clearSearch" onclick="clearAssetSearch()">✕</button>
@@ -1760,6 +1833,7 @@
         <div class="filter-scroll" id="filterPills"></div>
         <button class="btn btn-outline btn-sm import-btn" id="clearFiltersBtn" onclick="clearFilters()" style="display:none;">✕ Clear</button>
         <button class="btn btn-outline btn-sm import-btn" onclick="showImportView()">📥 Import</button>
+        <button class="desktop-refresh-btn" id="desktopRefreshBtn" onclick="loadAssets()" title="Refresh">🔄 Refresh</button>
       </div>
       <div class="count-bar" id="assetCountBar"></div>
       <div id="assetListWrap" style="position:relative; min-height:60px;">