Fix two crashes related to diagnostics and bugs in mouse-based columnar selection

Add `newline_below` action

Fix lockup on move

Touch ups

Implement default macOS menu items

- `Zed -> Hide`, bound to `cmd-h`
- `Zed -> Hide Others`, bound to `alt-cmd-h`
- `Zed -> Show All`
- `Window -> Minimize`, bound to `cmd-m`
- `Window -> Zoom`

Prevent Zed from hanging when changing tab size

This removes the need for a unit test.

Previously, we wouldn't generate any `TabEdit` when the tab size
changed, causing coordinate spaces in `WrapMap` and `BlockMap` to
become outdated.

This commit generates a synthetic edit that covers the entire `TabMap`
to ensure layers above are synchronized.

Tracking PR for Terminal rendering performance bugs

Auto-indent on tab for cursors left of the suggested indent level

Co-authored-by: Julia Risley <floc@unpromptedtirade.com>

Co-authored-by: Julia Risley <floc@unpromptedtirade.com>

Compute diffs based on characters rather than lines

Remove terminal integration test

Creating a full-fledged terminal is flaky and causes tests to either
hang or outright panic. The only test that requires creating a terminal
was `test_terminal` but we think the value added by that test is not
worth the flakiness, so we're removing it.

Co-Authored-By: Mikayla Maki <mikayla@zed.dev>

Previously, a change on a given line would cause that whole line to be
replaced. In turn, this caused anchors on that line to go to the start
of that line because they would lie inside of a deleted region after applying
the diff.

By switching to a character-wise diff, we perform smaller edits to the buffer
which stabilizes anchor positions.

Allow signing in again if authentication is pending or was unsuccessful

The local server that we spin up to receive OAuth callbacks isn't
called when an error occurs and it is non-trivial to do so with
next-auth. Besides, there could be cases where the user explicitly
closes the browser window before the callback can be invoked.

With this commit, the user can sign in even while an authentication
is still in progress. As opposed to waiting for at most 10 minutes
before killing the local HTTP server if we haven't received the callback,
we will repeatedly check for a response every second for 100 seconds.
This gives us a chance to determine whether a new authentication has started
in the meantime and, if so, abort the current authentication flow.

Co-authored-by: Julia Risley <floc@unpromptedtirade.com>

Assign 5 invites to users who redeem an invite code

Store config files under `~/.config/zed` and data files under `~/Library/Application Support/Zed`

Draft: Add "go to type definition" action