(core) Record Cards

Summary:
Adds a new Record Card view section to each non-summary table, which can be from opened from various parts of the Grist UI to view and edit records in a popup card view.

Work is still ongoing, so the feature is locked away behind a flag; follow-up work is planned to finish up the implementation and add end-to-end tests.

Test Plan: Python and server tests. Browser tests will be included in a follow-up.

Reviewers: jarek, paulfitz

Reviewed By: jarek

Subscribers: paulfitz

Differential Revision: https://phab.getgrist.com/D4114

test/server/lib/DocApi.ts

@@ -982,6 +982,7 @@ function testDocApi() {
             "id": "Table1",
             "fields": {
               "rawViewSectionRef": 2,
+              "recordCardViewSectionRef": 3,
               "primaryViewId": 1,
               "onDemand": false,
               "summarySourceTable": 0,
@@ -992,7 +993,8 @@ function testDocApi() {
           {
             "id": "Table2",
             "fields": {
-              "rawViewSectionRef": 4,
+              "rawViewSectionRef": 5,
+              "recordCardViewSectionRef": 6,
               "primaryViewId": 2,
               "onDemand": false,
               "summarySourceTable": 0,
@@ -1002,7 +1004,8 @@ function testDocApi() {
           {
             "id": "Table3_Renamed",
             "fields": {
-              "rawViewSectionRef": 6,
+              "rawViewSectionRef": 8,
+              "recordCardViewSectionRef": 9,
               "primaryViewId": 3,
               "onDemand": false,
               "summarySourceTable": 0,
@@ -1012,7 +1015,8 @@ function testDocApi() {
           {
             "id": "NewTable1",
             "fields": {
-              "rawViewSectionRef": 8,
+              "rawViewSectionRef": 11,
+              "recordCardViewSectionRef": 12,
               "primaryViewId": 4,
               "onDemand": false,
               "summarySourceTable": 0,
@@ -1022,7 +1026,8 @@ function testDocApi() {
           {
             "id": "NewTable2",
             "fields": {
-              "rawViewSectionRef": 10,
+              "rawViewSectionRef": 14,
+              "recordCardViewSectionRef": 15,
               "primaryViewId": 5,
               "onDemand": false,
               "summarySourceTable": 0,