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Merge conflict resolution for #36741 accidentally reverted the changes
in #36670 to allow expanding terminals individually and in #36675 to
allow collapsing edit cards. This PR re-applies those changes, fixing
the regression.

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- Add pulsating animation for context creases while they're loading
- Add spinner in message editors (replacing send button) during the
window where sending has been requested, but we haven't finished loading
the message contents to send to the model
- During the same window, ignore further send requests, so we don't end
up sending the same message twice if you mash enter while loading is in
progress
- Wait for context to load before rewinding the thread when sending an
edited past message, avoiding an empty-looking state during the same
window

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It's enough to add this to your settings:

```json
{
    "agent_servers": {
        "Name Of Your Agent": {
            "command": "/path/to/custom/agent",
            "args": ["arguments", "that", "you", "want"],
        }
    }
}
```

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This PR makes it so that all kinds of @-mentions start loading their
context as soon as they are confirmed. Previously, we were waiting to
load the context for file, symbol, selection, and rule mentions until
the user's message was sent. By kicking off loading immediately for
these kinds of context, we can support adding selections from unsaved
buffers, and we make the semantics of @-mentions more consistent.

Loading all kinds of context eagerly also makes it possible to simplify
the structure of the MentionSet and the code around it. Now MentionSet
is just a single hash map, all the management of creases happens in a
uniform way in `MessageEditor::confirm_completion`, and the helper
methods for loading different kinds of context are much more focused and
orthogonal.

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---------

Co-authored-by: Conrad <conrad@zed.dev>

We had a few people confused about why some features weren't working due
to the fallback logic.

It's gone.

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Also changes the message editor placeholder depending on the agent.

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---------

Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

Adds a new "acp: open debug tools" action that opens a new workspace
item with a log of ACP messages for the active connection.

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Closes #36577

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Users now accept ToS from Zed's website when they sign in to Zed the
first time. So it's no longer possible that a signed in account could
not have accepted the ToS.


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---------

Co-authored-by: Mikayla Maki <mikayla.c.maki@gmail.com>

Before:
<img width="356" height="50" alt="image"
src="https://github.com/user-attachments/assets/c4f4ae53-8820-4f22-b306-2e5062cfe552"
/>

After:
<img width="340" height="41" alt="image"
src="https://github.com/user-attachments/assets/8e69d9dc-5640-4e41-845d-f299fc5954e3"
/>


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- Fixed ANSI Bright Black and Bright White colors

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This PR identifies automatic configuration options that users can select
from the agent panel. If no default provider is set in their settings,
the PR defaults to the first recommended option. Additionally, it
updates the selected provider for a thread when a user changes the
default provider through the settings file, if the thread hasn't had any
queries yet.

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- agent: automatically select a language model provider if there's no
user set provider.

---------

Co-authored-by: Michael Sloan <michael@zed.dev>

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We had a frequent panic when the agent was using our edit file tool. The
root cause was that we were constructing a `BufferDiff` with
`BufferDiff::new`, then calling `set_base_text`, but not waiting for
that asynchronous operation to finish. This means there was a window of
time where the diff's base text was set to the initial value of
`""`--that's not a problem in itself, but it was possible for us to call
`PendingDiff::update` during that window, which calls
`BufferDiff::update_diff`, which calls
`BufferDiffSnapshot::new_with_base_buffer`, which takes two arguments
`base_text` and `base_text_snapshot` that are supposed to represent the
same text. We were getting the first of those arguments from the
`base_text` field of `PendingDiff`, which is set immediately to the
target base text without waiting for `BufferDiff::set_base_text` to run
to completion; and the second from the `BufferDiff` itself, which still
has the empty base text during that window.

As a result of that mismatch, we could end up adding `DeletedHunk` diff
transforms to the multibuffer for the diff card even though the
multibuffer's base text was empty, ultimately leading to a panic very
far away in rendering code.

I've fixed this by adding a new `BufferDiff` constructor for the case
where the buffer contents and the base text are (initially) the same,
like for the diff cards, and so we don't need an async diff calculation.
I also added a debug assertion to catch the basic issue here earlier,
when `BufferDiffSnapshot::new_with_base_buffer` is called with two base
texts that don't match.

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---------

Co-authored-by: Conrad <conrad@zed.dev>

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Prep work for deduping tool names

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The `PromptCapabilities` introduced in previous PRs were only getting
set on the main message editor and not for the editors in user messages.
This caused a bug where mentions would disappear after resending the
message, and for the completion provider to be limited to files.

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---------

Co-authored-by: Richard Feldman <oss@rtfeldman.com>

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Co-authored-by: Bennet Bo Fenner <bennetbo@gmx.de>

The loading diff animation can be jarring for external agents because
they stream the diff at the same time the tool call is pushed, so it's
only displayed while we're asynchronously calculating the diff. We'll
now only show it for the native agent.

Also, we'll now only update the diff when it changes, which avoids
unnecessarily hiding it for a few frames.

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Co-authored-by: Bennet Bo Fenner <bennetbo@gmx.de>

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On the latest build @maxbrunsfeld got a panic that hung zed. It appeared
that the hang occured after the minidump had been successfully written,
so our theory on what happened is that the `suspend_all_other_threads`
call in the crash handler suspended the panicking thread (due to the
signal from simulate_exception being received on a different thread),
and then when the crash handler returned everything was suspended so the
panic hook never made it to the `process::abort`.

This change makes the crash handler avoid _both_ the current and the
panicking thread which should avoid that scenario.

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This was causing panics due to the handles being dropped out of order.
It doesn't seem possible to guarantee the correct drop ordering given
that we're holding them over await points, so lets just spawn on the
tokio executor itself which gives us access to the state we needed those
handles for in the first place.

Fixes: ZED-1R

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Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>
Co-authored-by: Marshall Bowers <git@maxdeviant.com>

This will let us track crashes-per-launch using the new minidump-based
crash reporting.

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Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>
Co-authored-by: Marshall Bowers <git@maxdeviant.com>

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The completion provider was already limiting the mention kinds according
to `acp::PromptCapabilities`. However, it was still using
`ContentBlock::EmbeddedResource` when
`acp::PromptCapabilities::embedded_context` was `false`. We will now use
`ResourceLink` in that case making it more complaint with the
specification.

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Follow-up to #36524 

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- Fixed diff cards in agent threads not showing dividers between
disjoint edited regions.

Closes #ISSUE

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A previous PR changed the install command from `@latest` to `@preview`,
but the upgrade command kept suggesting `@latest`.

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See: https://github.com/zed-industries/agent-client-protocol/pull/20

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https://github.com/zed-industries/zed/pull/36633 relied on the prompt
request responding before cancel, but that's not guaranteed


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