Add full-text search

Add a search box with a quick results popover, as well full results in
the sidebar on pressing enter.

app/styles/app.css

@@ -74,6 +74,11 @@ body {
   pointer-events: auto; /* Re-enable clicks for buttons */
 }
 
+.header-left {
+  display: flex;
+  align-items: center;
+}
+
 .btn-press {
   transition: transform 0.1s;
 }
@@ -750,3 +755,158 @@ button.create-place {
     padding-bottom: env(safe-area-inset-bottom, 20px);
   }
 }
+
+/* Search Box Component */
+.search-box {
+  position: relative;
+  width: 100%;
+  max-width: 320px;
+  margin-left: 1rem;
+  z-index: 3002; /* Higher than menu button to be safe */
+}
+
+@media (max-width: 768px) {
+  .search-box {
+    max-width: 200px; /* Smaller on mobile */
+    margin-left: 0.5rem;
+  }
+}
+
+.search-form {
+  display: flex;
+  align-items: center;
+  background: white;
+  border-radius: 24px; /* Pill shape */
+  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.15);
+  padding: 0 0.75rem;
+  height: 40px;
+  transition: box-shadow 0.2s;
+}
+
+.search-form:focus-within {
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
+}
+
+.search-icon {
+  display: flex;
+  align-items: center;
+  color: #666;
+  margin-right: 0.5rem;
+}
+
+.search-input {
+  border: none;
+  background: transparent;
+  flex: 1;
+  height: 100%;
+  font-size: 1rem;
+  color: #333;
+  outline: none;
+  width: 100%;
+  padding: 0;
+  /* Remove native search cancel button in WebKit */
+  -webkit-appearance: none;
+}
+
+/* Remove 'x' from search input in Chrome/Safari */
+.search-input::-webkit-search-cancel-button {
+  -webkit-appearance: none;
+}
+
+.search-clear-btn {
+  background: none;
+  border: none;
+  padding: 4px;
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  color: #999;
+  border-radius: 50%;
+}
+
+.search-clear-btn:hover {
+  background: #f0f0f0;
+  color: #666;
+}
+
+/* Search Results Popover */
+.search-results-popover {
+  position: absolute;
+  top: 100%;
+  left: 0;
+  right: 0;
+  margin-top: 8px;
+  background: white;
+  border-radius: 8px;
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
+  overflow: hidden;
+  max-height: 400px;
+  overflow-y: auto;
+  z-index: 3002;
+}
+
+.search-results-list {
+  list-style: none;
+  padding: 0;
+  margin: 0;
+}
+
+.search-result-item {
+  width: 100%;
+  display: flex;
+  align-items: center; /* Vertical center alignment */
+  gap: 0.75rem;
+  padding: 0.75rem 1rem;
+  border: none;
+  background: white;
+  text-align: left;
+  cursor: pointer;
+  transition: background 0.1s;
+  border-bottom: 1px solid #f0f0f0;
+}
+
+.search-result-item:last-child {
+  border-bottom: none;
+}
+
+.search-result-item:hover,
+.search-result-item:focus {
+  background: #f5f5f5;
+  outline: none;
+}
+
+.result-icon {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 32px;
+  height: 32px;
+  background: #f0f0f0;
+  border-radius: 50%;
+  flex-shrink: 0;
+  color: #666;
+}
+
+.result-info {
+  display: flex;
+  flex-direction: column;
+  overflow: hidden; /* For text truncation if needed */
+}
+
+.result-title {
+  font-weight: 500;
+  color: #333;
+  font-size: 0.95rem;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.result-desc {
+  font-size: 0.8rem;
+  color: #777;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  margin-top: 2px;
+}