feat: add browse-at-scale — date ranges, load more, month navigator

CLI: --month YYYY-MM, --from/--to date range, --limit override
API: from/to query params for date range filtering
Web: load more button for pagination, month nav (◂/▸) in stream view

web/style.css

@@ -153,10 +153,65 @@ main {
     text-align: right;
 }
 
+/* Entity panel */
+#entity-panel {
+    display: flex;
+    flex-direction: column;
+    overflow: hidden;
+}
+
+#month-nav {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    padding: 8px 20px;
+    border-bottom: 1px solid var(--border);
+    flex-shrink: 0;
+}
+
+#month-nav:empty {
+    display: none;
+}
+
+.month-nav-btn {
+    background: none;
+    border: none;
+    color: var(--text-dim);
+    font-family: var(--font-mono);
+    font-size: 13px;
+    cursor: pointer;
+    padding: 2px 6px;
+    border-radius: 4px;
+    transition: all 0.1s;
+}
+
+.month-nav-btn:hover { color: var(--text); background: var(--bg-hover); }
+
+.month-nav-label {
+    font-family: var(--font-mono);
+    font-size: 13px;
+    color: var(--text);
+    min-width: 80px;
+    text-align: center;
+}
+
+.month-nav-clear {
+    background: none;
+    border: none;
+    color: var(--text-muted);
+    font-family: var(--font-mono);
+    font-size: 11px;
+    cursor: pointer;
+    margin-left: auto;
+}
+
+.month-nav-clear:hover { color: var(--text); }
+
 /* Entity list */
 #entity-list {
     overflow-y: auto;
     padding: 8px 0;
+    flex: 1;
 }
 
 .date-header {
@@ -483,6 +538,29 @@ main {
     font-family: var(--font-mono);
 }
 
+/* Load more */
+.load-more-wrap {
+    padding: 12px 20px;
+    text-align: center;
+}
+
+.load-more-btn {
+    background: var(--bg-hover);
+    border: 1px solid var(--border);
+    color: var(--text-dim);
+    padding: 6px 24px;
+    border-radius: var(--radius);
+    cursor: pointer;
+    font-family: var(--font-mono);
+    font-size: 12px;
+    transition: all 0.15s;
+}
+
+.load-more-btn:hover {
+    border-color: var(--accent);
+    color: var(--accent);
+}
+
 /* Absorb modal */
 .absorb-list {
     max-height: 300px;