Teams Updates 201908 (#11347)

* fix(teams): no hover bg change for noninteractive checkboxes

* feat(teams): send notification to managers on task claim
Also fix client unit test broken by prev commit

* feat(groups): don't penalize for tasks assigned since last activity

* fix(tests): actually fix client unit

* fix(teams): improve task styles

* fix(teams): let people other than leader see relevant approvals
Also more style fixes

* fix(approvals): better filtering and task headings for approval data

* fix(test): correct test expectations for new GET /approvals behavior

* fix(groups): style tweaks

* different border for group and normal tasks

* fix(teams): remove extra click for claiming

* fix(teams): leaders & managers can check off approval-required tasks

* fix(teams): don't notify user of own claim

* fix group task margin and z-index on hover

* fix(menu): sporadic error in top bar

* fix(teams): more approval header and footer adjustments

* fix(tests): adjust expectations for self-approval

* fix(teams): address PR comments

* refactor(timestamps): date user activity on authenticated requests

* refactor(timestamps): update local user instead of direct db update

website/server/models/task.js

@@ -115,6 +115,7 @@ export let TaskSchema = new Schema({
     id: {$type: String, ref: 'Group', validate: [v => validator.isUUID(v), 'Invalid uuid.']},
     broken: {$type: String, enum: ['GROUP_DELETED', 'TASK_DELETED', 'UNSUBSCRIBED']},
     assignedUsers: [{$type: String, ref: 'User', validate: [v => validator.isUUID(v), 'Invalid uuid.']}],
+    assignedDate: {$type: Date},
     taskId: {$type: String, ref: 'Task', validate: [v => validator.isUUID(v), 'Invalid uuid.']},
     approval: {
       required: {$type: Boolean, default: false},