Refine the colors of some more components (#12343)

* Refine the colors of some more components

This is a reintroduction of https://github.com/matrix-org/matrix-react-sdk/pull/12255, and should be the last part of the Compound color refinement work (https://github.com/element-hq/element-web/issues/26992). I've updated the following components to reflect design decisions (https://www.figma.com/file/pqhlirZFEwEp5XpudSbiia/Theming-Web-templates?type=design&node-id=80-60219&mode=design&t=mjqwylUie1vRwzOV-0) that will help them fit in better with the new design system:

- Message bubbles
- Pills
- Sent indicators
- Jump to bottom/unread buttons
- Composer placeholder
- Notification badges
- Room sublists
- Verification shields
- Date separators
- Tooltips

Closes https://github.com/element-hq/element-web/issues/22122

* Update some screenshots

res/css/views/elements/_Tooltip.pcss

@@ -71,8 +71,8 @@ limitations under the License.
     max-width: 300px;
     word-break: break-word;
 
-    background-color: #21262c; /* Same on both themes */
-    color: $accent-fg-color;
+    background-color: var(--cpd-color-alpha-gray-1400);
+    color: var(--cpd-color-text-on-solid-primary);
     border: 0;
     text-align: center;