Refactor ThreadSummary to MVVM (#33603)

* Refactor ThreadSummary to MVVM

* Stories Snapshot images

* Add ThreadSummary ViewModel coverage

* Fix ThreadSummary preview avatar rendering

* Remove ThreadSummary classnames helper

* Fix Prettier

* Match ThreadMessagePreview typography

* Move folder to correct path and fix storybook path

* Catch ThreadSummary preview refresh errors

* Update snapshot images + fix prettier

* Fix ThreadSummary classNames import

* Update Images

* Remove wrong path

apps/web/res/css/_components.pcss

@@ -293,7 +293,6 @@
 @import "./views/rooms/_SendMessageComposer.pcss";
 @import "./views/rooms/_Stickers.pcss";
 @import "./views/rooms/_ThirdPartyMemberInfo.pcss";
-@import "./views/rooms/_ThreadSummary.pcss";
 @import "./views/rooms/_TopUnreadMessagesBar.pcss";
 @import "./views/rooms/_UserIdentityWarning.pcss";
 @import "./views/rooms/_VoiceRecordComposerTile.pcss";

apps/web/res/css/views/rooms/_EventTile.pcss

@@ -1066,12 +1066,23 @@ $left-gutter: 64px;
         .mx_ThreadPanel_replies_amount {
             @mixin ThreadRepliesAmount;
         }
+    }
+}
 
-        .mx_ThreadSummary_content {
-            text-overflow: ellipsis;
-            overflow: hidden;
-            white-space: nowrap;
-        }
+.mx_ThreadSummary_icon {
+    display: inline-block;
+    margin-top: $spacing-8;
+    margin-bottom: $spacing-8;
+
+    > svg {
+        @mixin ThreadSummaryIcon;
+        vertical-align: middle;
+        margin-inline-end: $spacing-8;
+        margin-top: -2px;
+    }
+
+    a& {
+        color: $secondary-content;
     }
 }
 

apps/web/res/css/views/rooms/_ThreadSummary.pcss

@@ -1,125 +0,0 @@
-/*
-Copyright 2024 New Vector Ltd.
-Copyright 2022 The Matrix.org Foundation C.I.C.
-
-SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
-Please see LICENSE files in the repository root for full details.
-*/
-
-.mx_ThreadSummary,
-.mx_ThreadSummary_content {
-    color: $secondary-content;
-}
-
-.mx_ThreadSummary,
-.mx_ThreadSummary_icon {
-    margin-top: $spacing-8;
-}
-
-.mx_ThreadSummary {
-    min-width: 267px;
-    /* leave space on both left & right gutters */
-    max-width: min(calc(100% - var(--EventTile_group_line-spacing-inline-start)), 600px);
-    width: fit-content;
-    height: 40px;
-    position: relative;
-    background-color: $panels;
-    padding-inline: $spacing-12 $spacing-16;
-    display: flex;
-    align-items: center;
-    justify-content: flex-start;
-    border-radius: 8px;
-    box-sizing: border-box;
-    clear: both;
-    overflow: hidden;
-    border: 1px solid $panels; /* always render a border so the hover effect doesn't require a re-layout */
-    font: var(--cpd-font-body-sm-regular);
-
-    .mx_ThreadSummary_chevron {
-        position: absolute;
-        top: 0;
-        right: 0;
-        bottom: 0;
-        width: 60px;
-        box-sizing: border-box;
-        /* XXX: We use an HEXA `transparent` to work around a Safari <15.4 bug */
-        background: linear-gradient(270deg, $system 50%, $system-transparent 100%);
-
-        opacity: 0;
-        transform: translateX(60px);
-        transition: all 0.1s ease-in-out;
-
-        svg {
-            position: absolute;
-            top: 50%;
-            right: var(--cpd-space-1x);
-            transform: translateY(-50%);
-            width: 24px;
-            height: 24px;
-            color: $secondary-content;
-        }
-    }
-
-    &:hover,
-    &:focus {
-        border-color: $quinary-content;
-
-        .mx_ThreadSummary_chevron {
-            opacity: 1;
-            transform: translateX(0);
-        }
-    }
-
-    .mx_ThreadSummary_sender,
-    .mx_ThreadSummary_content,
-    .mx_ThreadSummary_replies_amount {
-        line-height: var(--EventTile_ThreadSummary-line-height);
-    }
-
-    .mx_ThreadSummary_sender,
-    .mx_ThreadSummary_content {
-        text-overflow: ellipsis;
-        overflow: hidden;
-        white-space: nowrap;
-    }
-
-    .mx_ThreadSummary_sender {
-        font-weight: var(--cpd-font-weight-semibold);
-    }
-
-    .mx_ThreadSummary_content {
-        margin-left: $spacing-4;
-        flex: 1;
-    }
-
-    .mx_ThreadSummary_replies_amount {
-        @mixin ThreadRepliesAmount;
-    }
-
-    .mx_MessagePanel_narrow & {
-        min-width: initial;
-        max-width: 100%; /* prevent overflow */
-        width: initial;
-    }
-}
-
-.mx_ThreadSummary_avatar {
-    margin-inline-end: $spacing-8;
-    flex-shrink: 0;
-}
-
-.mx_ThreadSummary_icon {
-    display: inline-block;
-    margin-bottom: $spacing-8;
-
-    > svg {
-        @mixin ThreadSummaryIcon;
-        vertical-align: middle;
-        margin-inline-end: $spacing-8;
-        margin-top: -2px;
-    }
-
-    a& {
-        color: $secondary-content;
-    }
-}