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

internal/api/tags.go

@@ -13,7 +13,8 @@ type TagResponse struct {
 
 func listTags(store *db.Store) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
-		tags, err := store.ListTags()
+		cardsOnly := r.URL.Query().Get("cards_only") == "true"
+		tags, err := store.ListTags(cardsOnly)
 		if err != nil {
 			writeInternalError(w, err)
 			return

internal/db/tags.go

@@ -5,12 +5,16 @@ type TagCount struct {
 	Count int
 }
 
-func (s *Store) ListTags() ([]TagCount, error) {
+func (s *Store) ListTags(cardsOnly bool) ([]TagCount, error) {
+	where := "WHERE e.deleted_at IS NULL"
+	if cardsOnly {
+		where += " AND e.card_type IS NOT NULL"
+	}
 	rows, err := s.db.Query(`
 		SELECT t.tag, COUNT(*) as cnt
 		FROM entity_tags t
 		JOIN entities e ON t.entity_id = e.id
-		WHERE e.deleted_at IS NULL
+		` + where + `
 		GROUP BY t.tag
 		ORDER BY t.tag`)
 	if err != nil {

internal/db/tags_test.go

@@ -4,7 +4,7 @@ import "testing"
 
 func TestListTags_Empty(t *testing.T) {
 	s := testStore(t)
-	tags, err := s.ListTags()
+	tags, err := s.ListTags(false)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -19,7 +19,7 @@ func TestListTags_Counts(t *testing.T) {
 	s.Create(&Entity{Body: "b", Glyph: GlyphNote, Tags: []string{"ops"}})
 	s.Create(&Entity{Body: "c", Glyph: GlyphNote, Tags: []string{"home"}})
 
-	tags, err := s.ListTags()
+	tags, err := s.ListTags(false)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -50,7 +50,7 @@ func TestListTags_ExcludesDeleted(t *testing.T) {
 
 	s.Create(&Entity{Body: "alive", Glyph: GlyphNote, Tags: []string{"here"}})
 
-	tags, err := s.ListTags()
+	tags, err := s.ListTags(false)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -61,3 +61,37 @@ func TestListTags_ExcludesDeleted(t *testing.T) {
 		t.Errorf("expected 'here', got %q", tags[0].Tag)
 	}
 }
+
+func TestListTags_CardsOnly(t *testing.T) {
+	s := testStore(t)
+	s.Create(&Entity{Body: "fluid", Glyph: GlyphNote, Tags: []string{"ops", "shared"}})
+
+	ct := CardSnippet
+	s.Create(&Entity{Body: "card", Glyph: GlyphNote, Tags: []string{"ops", "code"}, CardType: &ct})
+
+	all, err := s.ListTags(false)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(all) != 3 {
+		t.Fatalf("all tags: expected 3, got %d", len(all))
+	}
+
+	cards, err := s.ListTags(true)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(cards) != 2 {
+		t.Fatalf("card tags: expected 2, got %d", len(cards))
+	}
+	counts := map[string]int{}
+	for _, tc := range cards {
+		counts[tc.Tag] = tc.Count
+	}
+	if counts["ops"] != 1 {
+		t.Errorf("ops count: expected 1 (card only), got %d", counts["ops"])
+	}
+	if counts["code"] != 1 {
+		t.Errorf("code count: expected 1, got %d", counts["code"])
+	}
+}