Fix page-ref rule which was not bindable and failed fast

- page-ref had a :block/name embedded lookup ref which failed fast.
  datomic advises against this -
  https://docs.datomic.com/on-prem/schema/identity.html#:~:text=You%20cannot%20use%20them%20in%20the%20body%20of%20a%20query%2C%20use%20datalog%20clauses%20instead
- page-ref can handle binding args like last commit for page
- page-ref not failing fast on non-existing pages means that user can get meaningful results
  in more complex queries as seen in test
- Also remove try/catch as there should be no more queries that
  unintentionally cause the 'Nothing found for entity' error
- Also fixed lookup ref in srs cards which can be seen in stacktrace of
  #4576

src/test/frontend/db/query_dsl_test.cljs

@@ -355,12 +355,7 @@ tags: other
          nil
          ""
          " "
-         "\"\""))
-
-  (testing "Non exists page should be ignored"
-    (are [x] (nil? (dsl-query x))
-         "[[page-not-exist]]"
-         "[[another-page-not-exist]]")))
+         "\"\"")))
 
 (deftest page-ref-and-boolean-queries
   (load-test-files [{:file/path "pages/page1.md"
@@ -380,8 +375,8 @@ tags: other
         "Tag arg")
 
     (is (= []
-           (map :block/content (dsl-query "[[blarg]]")))
-        "Correctly returns no results"))
+           (dsl-query "[[blarg]]"))
+        "Nonexistent page returns no results"))
 
   (testing "basic boolean queries"
     (is (= ["b2 [[page 2]] #tag1"]
@@ -394,6 +389,11 @@ tags: other
                 (dsl-query "(or [[tag2]] [[page 2]])")))
         "OR query")
 
+    (is (= ["b1 [[page 1]] #tag2"]
+           (map :block/content
+                (dsl-query "(or [[tag2]] [[page 3]])")))
+        "OR query with nonexistent page should return meaningful results")
+
     (is (= ["foo:: bar\n" "b1 [[page 1]] #tag2" "b3"]
            (->> (dsl-query "(not [[page 2]])")
                 ;; Only filter to page1 to get meaningful results