Fix pending message feedback (#3543)

## Summary

- Keep `Sending…` beside message timestamps, including grouped pending
messages.
- Match the profile-card hover surface to inactive channel rows.

## Snapshots

### Pending message

![Pending message
status](https://raw.githubusercontent.com/block/buzz/655189aec0904677a68651f8aabf0e17d69734cd/pr-3543--pending-message-inline.png)

### Profile hover

![Profile
hover](https://raw.githubusercontent.com/block/buzz/655189aec0904677a68651f8aabf0e17d69734cd/pr-3543--profile-hover.png)

## Validation

- `pnpm -C desktop typecheck`
- `pnpm -C desktop check:file-sizes`
- `pnpm -C desktop build:e2e`
- `pnpm -C desktop exec playwright test
tests/e2e/message-feedback-snapshots.spec.ts --project=smoke`

---------

Signed-off-by: kenny lopez <klopez4212@gmail.com>

desktop/src/testing/e2eBridge.ts

@@ -1018,6 +1018,8 @@ declare global {
       mentionPubkeys?: string[];
       extraTags?: string[][];
       createdAt?: number;
+      /** Marks this test-only message as locally pending. */
+      pending?: boolean;
       /** 64-hex id required for the event to be a valid reaction target. */
       id?: string;
     }) => RelayEvent;
@@ -4014,6 +4016,7 @@ function emitMockChannelMessage(
   mentionPubkeys?: string[],
   extraTags?: string[][],
   createdAt?: number,
+  pending?: boolean,
   id?: string,
 ) {
   const eventKind = kind ?? 9;
@@ -4032,6 +4035,7 @@ function emitMockChannelMessage(
       createdAt,
       id,
     );
+    if (pending) event.pending = true;
     recordMockMessage(channelId, event);
     emitMockLiveEvent(channelId, event);
     return event;
@@ -4064,6 +4068,7 @@ function emitMockChannelMessage(
     createdAt,
     id,
   );
+  if (pending) event.pending = true;
   recordMockMessage(channelId, event);
   emitMockLiveEvent(channelId, event);
   return event;
@@ -9416,6 +9421,7 @@ export function maybeInstallE2eTauriMocks() {
     mentionPubkeys,
     extraTags,
     createdAt,
+    pending,
     id,
   }) => {
     const channel = mockChannels.find(
@@ -9434,6 +9440,7 @@ export function maybeInstallE2eTauriMocks() {
       mentionPubkeys,
       extraTags,
       createdAt,
+      pending,
       id,
     );
   };