feat(table): vista tabla por tipo de entidad (issue 0004)

- entity_ops: entity_list_rows (bulk pull id/name/type_ref/status/updated_at).
- AppState::TableRow + cache + filtros (search substring + show_all toggle).
- views_table: tabs por type_ref (alfabetico) o tabla unica con todos los
  tipos. ImGui::BeginTable con sort + clipper para >10k filas. Click en
  Selectable selecciona el nodo en el viewport (clear + add via
  graph_viewport_*).
- views_table_refresh_indices: degree + node_idx por user_data hash.
- main.cpp: panel "Table" en g_panels; cache build tras load_input y
  reload_after_mutation.

entity_ops.cpp

@@ -772,6 +772,44 @@ bool entity_list_by_tags(const char* db_path,
     return true;
 }
 
+bool entity_list_rows(const char* db_path,
+                       std::vector<EntityRowSnapshot>* out)
+{
+    if (!db_path || !out) return false;
+    out->clear();
+    sqlite3* db = nullptr;
+    if (sqlite3_open_v2(db_path, &db, SQLITE_OPEN_READONLY, nullptr) != SQLITE_OK) {
+        if (db) sqlite3_close(db);
+        return false;
+    }
+    const char* sql =
+        "SELECT id, COALESCE(name,''), COALESCE(type_ref,''), "
+        "       COALESCE(status,''), COALESCE(updated_at,'') "
+        "FROM entities ORDER BY type_ref, name";
+    sqlite3_stmt* st = nullptr;
+    if (sqlite3_prepare_v2(db, sql, -1, &st, nullptr) != SQLITE_OK) {
+        sqlite3_close(db);
+        return false;
+    }
+    while (sqlite3_step(st) == SQLITE_ROW) {
+        EntityRowSnapshot r;
+        const unsigned char* a0 = sqlite3_column_text(st, 0);
+        const unsigned char* a1 = sqlite3_column_text(st, 1);
+        const unsigned char* a2 = sqlite3_column_text(st, 2);
+        const unsigned char* a3 = sqlite3_column_text(st, 3);
+        const unsigned char* a4 = sqlite3_column_text(st, 4);
+        r.id         = a0 ? (const char*)a0 : "";
+        r.name       = a1 ? (const char*)a1 : "";
+        r.type_ref   = a2 ? (const char*)a2 : "";
+        r.status     = a3 ? (const char*)a3 : "";
+        r.updated_at = a4 ? (const char*)a4 : "";
+        out->push_back(std::move(r));
+    }
+    sqlite3_finalize(st);
+    sqlite3_close(db);
+    return true;
+}
+
 // ----------------------------------------------------------------------------
 // Index user_data -> sql id
 // ----------------------------------------------------------------------------