FIX: Broken computing of userHasTimezone in bookmark modal and missing tap-tile templates for regular users (#9229)

Based on reports here https://meta.discourse.org/t/improved-bookmarks-with-reminders/144542

* Because the `userHasTimezone` property was computed and we were checking on an (essentially) global object, ember was not aware that the user timezone had changed because it changed in a different place. instead set the timezone as internal state for the modal on show and base the computed property off of that so it mutates correctly
* The tap-tile components were in the admin folder completely unnecessarily, move them out into the main discourse folder otherwise noone else can use the new bookmarks (icon + text is missing)

app/assets/javascripts/discourse/controllers/bookmark.js

@@ -32,6 +32,7 @@ export default Controller.extend(ModalFunctionality, {
   customReminderTime: null,
   lastCustomReminderDate: null,
   lastCustomReminderTime: null,
+  userTimezone: null,
 
   onShow() {
     this.setProperties({
@@ -43,7 +44,8 @@ export default Controller.extend(ModalFunctionality, {
       customReminderDate: null,
       customReminderTime: null,
       lastCustomReminderDate: null,
-      lastCustomReminderTime: null
+      lastCustomReminderTime: null,
+      userTimezone: this.currentUser.timezone
     });
 
     this.loadLastUsedCustomReminderDatetime();
@@ -174,9 +176,9 @@ export default Controller.extend(ModalFunctionality, {
     return Discourse.BaseUri;
   },
 
-  @discourseComputed()
-  userHasTimezoneSet() {
-    return !_.isEmpty(this.userTimezone());
+  @discourseComputed("userTimezone")
+  userHasTimezoneSet(userTimezone) {
+    return !_.isEmpty(userTimezone);
   },
 
   saveBookmark() {
@@ -216,7 +218,7 @@ export default Controller.extend(ModalFunctionality, {
   },
 
   parseCustomDateTime(date, time) {
-    return moment.tz(date + " " + time, this.userTimezone());
+    return moment.tz(date + " " + time, this.userTimezone);
   },
 
   reminderAt() {
@@ -288,12 +290,8 @@ export default Controller.extend(ModalFunctionality, {
     return momentDate.hour(START_OF_DAY_HOUR).startOf("hour");
   },
 
-  userTimezone() {
-    return this.currentUser.timezone;
-  },
-
   now() {
-    return moment.tz(this.userTimezone());
+    return moment.tz(this.userTimezone);
   },
 
   laterToday() {

test/javascripts/controllers/bookmark-test.js.es6

@@ -3,7 +3,8 @@ let BookmarkController;
 
 moduleFor("controller:bookmark", {
   beforeEach() {
-    BookmarkController = this.subject({ currentUser: currentUser() });
+    Discourse.currentUser = currentUser();
+    BookmarkController = this.subject({ currentUser: Discourse.currentUser });
   },
 
   afterEach() {
@@ -12,7 +13,7 @@ moduleFor("controller:bookmark", {
 });
 
 function mockMomentTz(dateString) {
-  let now = moment.tz(dateString, BookmarkController.currentUser.timezone);
+  let now = moment.tz(dateString, BookmarkController.userTimezone);
   sandbox.useFakeTimers(now.valueOf());
 }
 
@@ -179,3 +180,15 @@ QUnit.test(
     assert.equal(BookmarkController.lastCustomReminderTime, null);
   }
 );
+
+QUnit.test(
+  "userHasTimezoneSet updates true/false based on whether the current user timezone is set globally",
+  function(assert) {
+    Discourse.currentUser.timezone = null;
+    BookmarkController.onShow();
+    assert.equal(BookmarkController.userHasTimezoneSet, false);
+    Discourse.currentUser.timezone = "Australia/Brisbane";
+    BookmarkController.onShow();
+    assert.equal(BookmarkController.userHasTimezoneSet, true);
+  }
+);