fix(ui): tag counts, j/k nav, stream layout, search alignment

- Tag rail counts now reflect cards-only when in cards view
  (ListTags accepts cardsOnly filter, JS passes it per view)
- j/k navigation scoped to visible (intent/search filtered) list
- scrollSelectedIntoView works in both stream and cards view
- Entity items wrap title/desc/preview in .entity-content flex
  container so tags/pills align right consistently
- Title no longer eaten by description/body (flex-shrink + min-width)
- Search bar centered in header with margin auto
- switchView awaits loadEntities+loadTags to fix stale intent counts

web/style.css

@@ -117,6 +117,7 @@ nav { display: flex; gap: 2px; }
 .header-search {
     flex: 1;
     max-width: 400px;
+    margin: 0 auto;
 }
 
 #search-input {
@@ -363,6 +364,14 @@ main {
 .glyph-decision { color: var(--note); }
 .glyph-link { color: var(--event); }
 
+.entity-content {
+    flex: 1;
+    min-width: 0;
+    display: flex;
+    align-items: center;
+    overflow: hidden;
+}
+
 .entity-title {
     font-family: var(--sans);
     font-size: 12px;
@@ -370,6 +379,8 @@ main {
     white-space: nowrap;
     overflow: hidden;
     text-overflow: ellipsis;
+    flex-shrink: 1;
+    min-width: 60px;
 }
 
 .entity-desc {
@@ -381,6 +392,8 @@ main {
     overflow: hidden;
     text-overflow: ellipsis;
     margin-left: 8px;
+    flex-shrink: 1;
+    min-width: 0;
 }
 
 .entity-preview {
@@ -391,10 +404,13 @@ main {
     overflow: hidden;
     text-overflow: ellipsis;
     margin-left: 8px;
+    flex: 1;
+    min-width: 0;
 }
 
 .entity-body {
     flex: 1;
+    min-width: 0;
     font-family: var(--mono);
     font-size: 12px;
     white-space: nowrap;