### Todo

* [x] Add back chat functionality, connected to channels
* [x] Channels panel
* [x] channels with active calls take up two rows, facepile goes on the
second row
* [x] icons for note, phone, (maybe chat) appear on the right of channel
names
    * [x] clicking a channel opens the chat
    * [x] style
* [x] Chat panel
    * [ ] Render markdown in chat messages
    * [x] style
* [x] Hide unless user is staff or has `channels_alpha` feature flag.

There are around ~400 icons in the `assets/icons` folder, but in reality
including file icons we only use around 50. In a number of places we use
different variants of the same icon, even in different styles.

This PR unifies the icons we use, removes the duplicates, and cleans out
unused icons.

Release Notes:

- Made icons more consistent throughout the app.

For zed-industries/community#2044

Fix from @maxbrunsfeld
https://zed-industries.slack.com/archives/C04S5TU0RSN/p1694722631644249

Release Notes:

- vim: Support `shift-d` and `shift-x` to delete in visual mode

This moves the IME shortcut handling over to the keystroke matcher so
that it
can not clear pending matches when trying out the IME equivalent.

Release Notes:

- vim: add `g s` / `g S` to show symbols in the current buffer /
workspace
- Fix multi-key shortcuts with modifiers (preview-only)

I'm testing RustRover

Release Notes:

- Fixed a bug that was preventing errors from being shown in the inline
assistant when it was still deployed. (preview-only)

This pull request introduces an additional step to
`SemanticIndex::search_project` that includes the content of buffers
that are modified but haven't been saved yet. In most cases, the buffer
will contain a small portion of changed spans that are potentially not
included in the index. To reuse all the other spans that haven't
changed, we will query the database for embeddings by their digest. This
means we have to index spans by their digest, which means some penalty
when writing, but in our tests this didn't seem to make indexing much
slower.

Release Notes:

- Improved semantic search to include results from modified buffers.
(preview-only)

Fixes
```
thread 'main' panicked at 'byte index 2 is not a char boundary; it is inside '…' (bytes 0..3) of `…)`'
```
panics like
https://zed-industries.slack.com/archives/C04S6T1T7TQ/p1694535396473329

by reworking the inlay hover model:
* avoid storing "hardcoded" coordinates of hovered inlay labels (such as
`InlayOffset`), instead, remember `inlay_id` and apply required
highlights there when hint with the same id is handled
* add randomized tests on inlay highlights
* sped up inlay hint cache lookup by inlay_id

As a downside, background highlights are no long appearing on inlay
hints, but Zed does not receive any tooltips for inlays anyway (r-a does
not send them for some reason, other LSP seem to have no such feature?),
so it does not matter now.
Nontheless, if the logic for displaying hint pop-ups is present and
works for harcoded tooltips in r-a, only background highlight is missing
now.

Release Notes:

- Fixed inlay hint highlights causing panic for certain cases with
"large" characters

No keyboard shortcut yet.

This allows users to add a keybind to ToggleReplace from Editor/Pane
contexts.

Release Notes:
- Fixed replace in buffer not reacting to keyboard shortcuts outside of
search bar<preview-only>.

We're using [PostgREST](https://hub.docker.com/r/postgrest/postgrest)

Todo:
* [x] Add instructions for installing postgrest to local development
docs
* [x] Deploy to staging
* [x] Deploy to production
* [x] Add DNS record for `admin-staging.zed.dev` pointing to the staging
db
* [x] Add a DNS record for `admin.zed.dev` pointing to the production db

To make this work we need to move the handling of multiple possible key
events into the keyboard shortcut system.

This was broken in #2957.

Small fix to update code for rate limiting status.

Release Notes (Preview only)
- Fixed update to only stop updating status, when the rate limit is
reset to None

Co-Authored-By: Antonio Scandurra <antonio@zed.dev>