Create a common header on right panel cards on BaseCard (#8808)

* Remove duplicate declarations and add height and overflow properties

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Move mx_TimelineCard__header under mx_BaseCard_header for normalization

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Normalize mx_BaseCard_close position

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Normalize className of header

- mx_BaseCard_header__ThreadPanel
- mx_BaseCard_header__TimelineCard

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Normalize header's button size

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Normalize inline start header margin

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* normalize header bottom margin for PinnedMessagesCard and TimelineCard

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Normalize header declarations

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Add mixin RightPanelCard

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Move common declarations - top level

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Move common declarations - mx_BaseCard_header

Remove specific declarations on PinnedMessagesCard

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Move common declarations - mx_BaseCard_back and mx_BaseCard_close

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Create a common class name - mx_BaseCard_header_title

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Create a common class name - mx_BaseCard_header_title - ThreadPanel

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Move common declarations - mx_BaseCard_header_title

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Move common declarations - span:first-of-type

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove redundant declarations

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Rename a variable to remove --ThreadPanel_header-button-size

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove class name - mx_BaseCard_header_title

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove mx_BaseCard_header_title--ThreadPanel and h2 declarations from PinnedMessagesCard

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Headers need Heading

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Use spacing variables

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Move common style rules of mx_ContextualMenu inside mx_BaseCard_header_title to BaseCard

leaving style rules specific to ThreadPanel.

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Hide long header title with ellipsis

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Merge style rules - BaseCard_header-button-size

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Merge style rules - BaseCard_header margin-bottom

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Merge style rules - BaseCard back and close margin

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Merge style rules - BaseCard back ~ mx_BaseCard_header_title

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Merge style rules - mx_BaseCard_header_title

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Return special declarations to _ThreadPanel.scss

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove the mixin

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Add mx_BaseCard_header_title_button--option

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove redundant margin from AppTileFullWidth

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Header on mx_RoomSummaryCard - remove default declarations

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove default declarations from mx_UserInfo

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Use variables - _BaseCard.scss

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

src/components/views/context_menus/ThreadListContextMenu.tsx

@@ -82,7 +82,7 @@ const ThreadListContextMenu: React.FC<IProps> = ({
     return <React.Fragment>
         <ContextMenuTooltipButton
             {...props}
-            className="mx_MessageActionBar_maskButton mx_MessageActionBar_optionsButton"
+            className="mx_BaseCard_header_title_button--option"
             onClick={openMenu}
             title={_t("Thread options")}
             isExpanded={menuDisplayed}