Cherry-pick of #50898 to preview

----
Release Notes:

- Linux: Handle GPU device loss gracefully

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

Cherry-pick of #50858 to preview

----
Add GPT-5.4 and GPT-5.4-pro as Bring Your Own Key model options for the
OpenAI provider.

**GPT-5.4** (`gpt-5.4`):
- 1,050,000 token context window, 128K max output
- Supports chat completions, images, parallel tool calls
- Default reasoning effort: none

**GPT-5.4-pro** (`gpt-5.4-pro`):
- 1,050,000 token context window, 128K max output
- Responses API only (no chat completions)
- Default reasoning effort: medium (supports medium/high/xhigh)

Also fixes context window sizes for GPT-5 mini and GPT-5 nano (272K →
400K) to match current OpenAI docs.

Closes AI-78

Release Notes:

- Added GPT-5.4 and GPT-5.4-pro as available models when using your own
OpenAI API key.

Co-authored-by: Richard Feldman <richard@zed.dev>

Closes #ISSUE

Before you mark this PR as ready for review, make sure that you have:
- [ ] Added a solid test coverage and/or screenshots from doing manual
testing
- [ ] Done a self-review taking into account security and performance
aspects
- [ ] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- N/A *or* Added/Fixed/Improved ...

Cherry-pick of #50875 to preview

----
Fixes ZED-5G8

If `DisplayLink::new` fails, `frame_requests` is dropped . It is not
valid to destroy a DispatchSource that is not `resume()`d. So, ensure we
call `resume()` before there's a chance for anything to fail.

Release Notes:

- Fixed a crash that could occur on macOS when changing monitor
configurations

Co-authored-by: John Tur <john-tur@outlook.com>

Cherry-pick of #50868 to preview

----
Make sure we don't download this file if disable_ai is enabled

Release Notes:

- N/A

Co-authored-by: Ben Brandt <benjamin.j.brandt@gmail.com>

Cherry-pick of #50864 to preview

----
Remove the conditional fullscreen path for subagent tool calls so
expanded content consistently renders as a capped preview with the
overlay and fixed height. Also add a pointer cursor to the maximize
control to clarify clickability.

Release Notes:

- N/A

Co-authored-by: Ben Brandt <benjamin.j.brandt@gmail.com>

Cherry-pick of #50862 to preview

----
These aren't built in anymore!

Release Notes:

- N/A

Co-authored-by: Ben Brandt <benjamin.j.brandt@gmail.com>

See
https://github.com/zed-industries/zed/actions/runs/22676830288/job/65735747311

Release Notes:

- N/A

Release Notes:

- N/A

This is already expected on the cloud side. This lets us know under
which organization the user is logged in when requesting an llm_api
token.

Closes CLO-337

Release Notes:

- N/A

Adds a consent banner, similar to the one on zed.dev

Before you mark this PR as ready for review, make sure that you have:
- [x] Added a solid test coverage and/or screenshots from doing manual
testing
- [x] Done a self-review taking into account security and performance
aspects
- [x] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- N/A

This PR cleans up the git command spawning by wrapping everything in
GitBinary instead to follow a builder/factory pattern. It also extends
trusted workspace support to git commands.

I also added a `clippy.toml` configuration to our git crate that warns
against using `Command` struct to spawn git commands instead of going
through `GitBinary`. This should help us maintain the factory pattern in
the future

Before you mark this PR as ready for review, make sure that you have:
- [x] Added solid test coverage and/or screenshots from doing manual
testing
- [x] Done a self-review taking into account security and performance
aspects

Release Notes:

- git: Add trusted workspace support for Zed's git integration

Refactor the changes introduced in
https://github.com/zed-industries/zed/pull/50525, in order to remove the
`DisplayMap.clear_folded_buffer` method and update the editor's handling
of `multi_buffer::Event::ExcerptsRemoved` to actually call
`DisplayMap.unfold_buffers`, which correctly updates the `BlockMap`
using its `BlockMapWriter`, ensuring that the block map is synced.

Before you mark this PR as ready for review, make sure that you have:
- [X] Added a solid test coverage and/or screenshots from doing manual
testing
- [X] Done a self-review taking into account security and performance
aspects
- [X] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- N/A

I noticed that the minimap seems to render underlines with the same
thickness as the main editor, which looks a bit off. This becomes much
more noticeable when enabling `semantic_token_rules` (due to the
increased number of underlines):

```json
"global_lsp_settings": {
  "semantic_token_rules": [
    {
      "token_modifiers": ["mutable"],
      "underline": true,
    },
  ],
}
```
Looking at the existing code, I found that diagnostic underlines already
check `editor_style.show_underlines` to ensure they are only displayed
in the main editor. To maintain consistency, I applied the same
filtering logic to `chunk_highlight` so that these underlines are no
longer rendered in the minimap.

Before：
<img alt="CleanShot 2026-02-06 at 02 28 31@2x"
src="https://github.com/user-attachments/assets/16401154-23f5-43ef-a7a8-b1035c19e076"
/>
After：
<img alt="CleanShot 2026-02-06 at 02 31 36@2x"
src="https://github.com/user-attachments/assets/979a04be-e585-44be-9c42-4dfab7b89186"
/>

Release Notes:

- N/A *or* Added/Fixed/Improved ...

Since the read times always correspond to an action log call anyway, we
can let the action log track this internally, and we don't have to
provide a reference to the Thread in as many tools.

Release Notes:

- N/A

---------

Co-authored-by: Bennet Bo Fenner <bennetbo@gmx.de>
Co-authored-by: MrSubidubi <dev@bahn.sh>

`.cppm` is the widely used extension for C++20 module interface units,
supported by MSVC, Clang, and GCC. Currently Zed doesn't recognize it as
C++, so users get no syntax highlighting or LSP support.

Changes:
`crates/languages/src/cpp/config.toml`: add cppm to path_suffixes
`crates/theme/src/icon_theme.rs`: add cppm to the C++ icon matcher

https://github.com/search?q=path%3A*.cppm&type=code

Release Notes:

- N/A

Adds the actual tool name so people can turn it off if they want.

Release Notes:

- N/A

Co-authored-by: Bennet Bo Fenner <bennetbo@gmx.de>
Co-authored-by: MrSubidubi <dev@bahn.sh>

Previously, there was no way to view the full thread context

Release Notes:

- N/A

Co-authored-by: Bennet Bo Fenner <bennetbo@gmx.de>
Co-authored-by: MrSubidubi <dev@bahn.sh>

Release Notes:

- N/A

IAM users cannot be assumed; only IAM roles can be.

Before you mark this PR as ready for review, make sure that you have:
- [ ] Added a solid test coverage and/or screenshots from doing manual
testing
- [ ] Done a self-review taking into account security and performance
aspects
- [ ] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- N/A

Closes #46767

## Summary

The "Reveal in File Manager" action was shown in the context menu for
WSL projects (guarded by `is_via_wsl_with_host_interop`), but the action
handler in `Render` was only registered when `project.is_local()` —
which returns `false` for WSL. Dispatching the action without a handler
caused a crash.

Adds the same `is_via_wsl_with_host_interop(cx)` check to the handler
registration.

## Testing

- Ran `cargo test -p project_panel` — 78 passed, 0 failed
- Manual testing: connected to WSL Ubuntu, right-clicked a file in the
project panel, used "Reveal in File Manager" — Windows Explorer opened
correctly without crashing

Before you mark this PR as ready for review, make sure that you have:
- [x] Added a solid test coverage and/or screenshots from doing manual
testing
- [x] Done a self-review taking into account security and performance
aspects
- [x] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- Fixed a crash when using "Reveal in File Manager" on files in WSL
projects (#46767).

Continues #47114

Release Notes:

- Fixed REPL output width clamping to apply to the content area so
images don’t get clipped by controls

---------

Co-authored-by: MrSubidubi <finn@zed.dev>

Hi! The `...` entry in the `language_servers` setting was only explained
in a single bullet point, which led users to misconfigure their setup,
particularly when overriding defaults that disable certain servers with
`!`.

Add a detailed explanation of how `...` works and a table of examples
using Ruby's real server configuration to illustrate the override
behavior.

Before you mark this PR as ready for review, make sure that you have:
- [ ] Added a solid test coverage and/or screenshots from doing manual
testing
- [ ] Done a self-review taking into account security and performance
aspects
- [ ] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- N/A

The purpose of `register_available_lsp_adapter()` is to allow language
servers to be reused across multiple languages. Since adapters like
`ty`, `pylsp`, and `pyright` are specific to Python, there is no need to
register them for other languages. Additionally, registering them
directly to the global `LanguageRegistry` results in negligible resource
consumption.

We can then use the default settings to control the default language
server for Python, as referenced here:


https://github.com/zed-industries/zed/blob/9c9337a8021f74511625517c3f4fa021106609eb/assets/settings/default.json#L2119-L2130

Additionally, the documentation for Python has been updated to clarify
that the `"..."` syntax does not mean "keep the rest at default," but
rather "include all other available servers."

Before you mark this PR as ready for review, make sure that you have:
- [ ] Added a solid test coverage and/or screenshots from doing manual
testing (no sure how to add test for this)
- [x] Done a self-review taking into account security and performance
aspects
- [x] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- N/A *or* Added/Fixed/Improved ...

The main intention behind this change is to support uploading these
files
to GitHub. `.miniprof` is not a supported extension by GitHub, but
`.json` is.

The only “downside” to this change is that the cleanup process will have
to look
for `.miniprof` files AND `.miniprof.json` files. Maybe we can remove
that change
at a later date?

Ref:
https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/attaching-files

Before you mark this PR as ready for review, make sure that you have:
- [ ] Added a solid test coverage and/or screenshots from doing manual
testing
- [x] Done a self-review taking into account security and performance
aspects
- [x] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- Changed miniprofiler file extension to `.miniprof.json`

Release Notes:

- Added `cmd-y` keybinding for accepting changes in the agent diff
review, matching the git diff review shortcut.

Fixes ZED-4JD

Release Notes:

- Fix a panic when opening the remote server modal

Release Notes:

- Fixed Zed failing to initialize OpenGL on certain Linux devices

Release Notes:

- Token counts and scroll position are restored when loading a previous
agent thread

Closes #50574

Release Notes:

- Fixed Zed not being responsive on some Linux configurations

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

Since we were no longer just returning a string, we need to update the
content in both success and error modes to get a nice rendering
experience.

Release Notes:

- N/A

Release Notes:

- N/A

Closes #ISSUE

Before you mark this PR as ready for review, make sure that you have:
- [ ] Added a solid test coverage and/or screenshots from doing manual
testing
- [ ] Done a self-review taking into account security and performance
aspects
- [ ] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- N/A *or* Added/Fixed/Improved ...

Closes #ISSUE

Before you mark this PR as ready for review, make sure that you have:
- [ ] Added a solid test coverage and/or screenshots from doing manual
testing
- [ ] Done a self-review taking into account security and performance
aspects
- [ ] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- Added support for providing an API key to OpenAI-compatible edit
prediction providers

When a downstream project was disconnected from the host (e.g. the guest
left the call), `disconnected_from_host_internal` did not clear
`client_subscriptions`. These subscriptions hold entries in the
`Client`'s entity subscription map, so a subsequent
`join_remote_project` with the same project ID would fail with "already
subscribed to entity".

The fix adds `self.client_subscriptions.clear()` to
`disconnected_from_host_internal`, matching what `unshare_internal`
already does for the host side.

Before you mark this PR as ready for review, make sure that you have:
- [x] Added a solid test coverage and/or screenshots from doing manual
testing
- [x] Done a self-review taking into account security and performance
aspects

Release Notes:

- collab: Fix unable to rejoin project bug ("already subscribed to
entity")

This can be used like `ep predict --provider
baseten:V0131GitMergeMarkersPrefix`. Since it doesn't require
load_project, it can be used with captured requests.


Release Notes:

- N/A

The main issue is that we weren't forwarding the proto messages through
the collab server to the host. After fixing that I added integration
tests to cover local worktrees, remote worktrees, and ssh worktrees.

I also fixed a bug with FakeRepository where it wouldn't name its
current branch as a worktree when calling git worktree, which doesn't
match the behavior of the git binary.

Before you mark this PR as ready for review, make sure that you have:
- [x] Added a solid test coverage and/or screenshots from doing manual
testing
- [x] Done a self-review taking into account security and performance
aspects

Release Notes:

- git: Fix bug that caused the git worktree picker from displaying and
creating worktrees over collab

I've been using
https://github.com/zed-industries/zed/issues/15046#issuecomment-3259286451
for half a year now, and it seems worthy of inclusion in the default
keymap.

Before you mark this PR as ready for review, make sure that you have:
- [ ] Added a solid test coverage and/or screenshots from doing manual
testing
- [x] Done a self-review taking into account security and performance
aspects
- [x] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- Added `ctrl-enter` keybind on macOS to type a newline in search bars

Release Notes:

- N/A

Release Notes:

- N/A

Release Notes:

- Windows: make auto-update more robust in the face of apps holding the
Zed.exe handle

---------

Co-authored-by: Jakub Konka <kubkon@jakubkonka.com>

We would mark `FileNotFound` as success and progress the update loop
which does not make much sense.

Release Notes:

- Do not skip update roll back in presence of FileNotFound errors on Windows.

Co-authored-by: Miguel Raz Guzman Macedo <raz@zed.dev>

## Problem
- On Linux, non-recursive watcher registrations remained path-cached
after deleting and recreating a directory in the same session.
- The recreated directory was not re-watched, so newly created child
entries under that path could be missing.

## Summary
- Remove directory watcher registrations when worktree paths are removed
from snapshot state.
- Ensure recreated directories can be watched again on Linux by allowing
`scan_dir` to re-add fresh watches.
- Add a Linux integration regression test for directory delete/recreate
path reuse and child file creation.

## Testing
- `cargo test -p project --features test-support --test integration
test_recreated_directory_receives_child_events -- --exact`
- `cargo test -p project --features test-support --test integration
test_rescan_and_remote_updates -- --exact`

## Related
- #46709

Release Notes:

- Fixed Linux worktree file watching so child entries appear after
deleting and recreating a directory at the same path.

Release Notes:

- Fixed extraneous buffer header when splitting the commit view.

Add the thread target selector in the agent panel behind the
`agent-git-worktrees` flag:

<img width="590" height="121" alt="Screenshot 2026-03-02 at 11 50 47 PM"
src="https://github.com/user-attachments/assets/17ee3303-7e01-4e40-bb84-1e7e748a3196"
/>

- Add a "Start Thread In..." dropdown to the agent panel toolbar, gated
behind `AgentV2FeatureFlag`
- Options: "Local Project" (default) and "New Worktree"
- The "New Worktree" option is disabled when there's no git repository
or in collab mode

Closes AI-34

Release Notes:

- N/A

---------

Signed-off-by: Xiaobo Liu <cppcoffee@gmail.com>
Co-authored-by: Oleksiy Syvokon <oleksiy@zed.dev>
Co-authored-by: Ben Brandt <benjamin.j.brandt@gmail.com>
Co-authored-by: Anthony Eid <56899983+Anthony-Eid@users.noreply.github.com>
Co-authored-by: Remco Smits <djsmits12@gmail.com>
Co-authored-by: morgankrey <morgan@zed.dev>
Co-authored-by: Danilo Leal <67129314+danilo-leal@users.noreply.github.com>
Co-authored-by: Ben Kunkle <ben@zed.dev>
Co-authored-by: Finn Evers <finn@zed.dev>
Co-authored-by: Bennet Bo Fenner <bennet@zed.dev>
Co-authored-by: Zed Zippy <234243425+zed-zippy[bot]@users.noreply.github.com>
Co-authored-by: MostlyK <135974627+MostlyKIGuess@users.noreply.github.com>
Co-authored-by: cameron <cameron.studdstreet@gmail.com>
Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>
Co-authored-by: John Tur <john-tur@outlook.com>
Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>
Co-authored-by: Wuji Chen <chenwuji2000@gmail.com>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Smit Barmase <heysmitbarmase@gmail.com>
Co-authored-by: Cole Miller <cole@zed.dev>
Co-authored-by: Kasper Nyhus <kanyhus@gmail.com>
Co-authored-by: dino <dinojoaocosta@gmail.com>
Co-authored-by: Anthony Eid <hello@anthonyeid.me>
Co-authored-by: Josh Robson Chase <josh@robsonchase.com>
Co-authored-by: ozacod <47009516+ozacod@users.noreply.github.com>
Co-authored-by: ozacod <ozacod@users.noreply.github.com>
Co-authored-by: Xiaobo Liu <cppcoffee@gmail.com>
Co-authored-by: Lena <241371603+zelenenka@users.noreply.github.com>
Co-authored-by: 0x2CA <2478557459@qq.com>
Co-authored-by: Joseph T. Lyons <JosephTLyons@gmail.com>
Co-authored-by: Albab Hasan <155961300+Albab-Hasan@users.noreply.github.com>
Co-authored-by: KyleBarton <kjb@initialcapacity.io>
Co-authored-by: Kunall Banerjee <hey@kimchiii.space>
Co-authored-by: Lukas Wirth <lukas@zed.dev>
Co-authored-by: Tom Houlé <13155277+tomhoule@users.noreply.github.com>
Co-authored-by: Nikhil Pandey <nikhil@nikhil.com.np>
Co-authored-by: Mikayla Maki <mikayla@zed.dev>
Co-authored-by: dancer <144584931+dancer@users.noreply.github.com>
Co-authored-by: Kirill Bulatov <kirill@zed.dev>
Co-authored-by: Danilo Leal <daniloleal09@gmail.com>

### Summary

Makes file mention chips in the AI chat input clickable to open the
referenced files. Previously, chips like `@README.md` were purely visual
indicators with no interaction.

### Changes
- **Clickable mention chips**: Users can now click on file mentions in
the chat input to open those files in the editor
- **Support for all mention types**:
  - Files → Opens in editor
  - Files with line numbers → Opens and scrolls to line
  - Directories → Reveals in project panel
  - Threads → Navigates to thread
  - Rules → Opens rules library
  - URLs → Opens in browser
- **Handles files outside workspace**: Falls back to `open_abs_path()`
for files not in the current workspace

### Implementation

Threads `MentionUri` and `WeakEntity<Workspace>` through the crease
rendering pipeline:

1. Updated `insert_crease_for_mention()` to accept mention URI and
workspace references
2. Added click handler to `MentionCrease` component using `.when()` for
conditional attachment
3. Implemented file opening helpers that mirror the existing
`thread_view.rs::open_link()` logic

### Demo


https://github.com/user-attachments/assets/21b2afb7-7a86-4a0a-aba1-e24bb1b650c2

### Testing

Manually tested:

- [x] Clicking `@README.md` opens file
- [x] Clicking file with line numbers navigates correctly
- [x] Clicking directory reveals in project panel
- [x] Files outside workspace open via absolute path

### Files Changed

- `crates/agent_ui/src/mention_set.rs` - Thread URI/workspace through
pipeline
- `crates/agent_ui/src/ui/mention_crease.rs` - Add click handler and
file opening logic
- `crates/agent_ui/src/acp/message_editor.rs` - Update call sites

### Review feedback addressed

- Replaced `.when()` + `unwrap()` with `.when_some()` + `Option::zip()`
(`0e36efb4eb`)
- De-duplicated `open_file` and `open_file_at_line` into a single
function with `Option<RangeInclusive<u32>>` (`dbcbb69a4b`)
  - Rebased onto latest `main` and resolved conflicts

  Also update item 2 under Implementation from:
_Added click handler to MentionCrease component using `.when()` for
conditional attachment_

  to:
_Added click handler to MentionCrease component using `.when_some()`
with `Option::zip()` for conditional attachment_

### Release Notes:

- agent: File mention chips in the chat input are now clickable and will
open the referenced files in the editor.

Closes  #46746

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

## **Description:**

**Context:**
This PR introduces an initial CSV preview feature for Zed, building upon
two previously merged infrastructure PRs:
- [#46341](https://github.com/zed-industries/zed/pull/46341) - Data
table dynamic column support (removed const generics)
- [#46190](https://github.com/zed-industries/zed/pull/46190) - Variable
row height mode for data tables

This implementation is based on the [original draft PR
#44344](https://github.com/zed-industries/zed/pull/44344), which has
been carefully decomposed into smaller, reviewable pieces.

---

#### **Features Included:**

**Core Infrastructure:**
- Live CSV parsing with smart debouncing (200ms cooldown)
- Performance monitoring with built-in timing metrics (not displayed in
UI yet)
- Automatic file change detection and re-parsing
- Support for quoted fields, multiline cells, and escaped characters

**Table Display:**
- Variable row height rendering with fallback to uniform mode
(switchable via settings)
- Draggable column resizing (reusing existing data table infrastructure)
- Row identifiers supporting both source line numbers and sequential row
numbers
- Configurable font rendering (UI font vs monospace)
- Tooltips showing full cell content on hover

**Interactive Features:**
- Column sorting (ascending/descending) with visual indicators

**Settings Panel:**
- Toggle between variable/uniform row rendering
- Font type selection (UI/monospace)
- Row identifier type configuration
- Debug information display
- Multiline cell rendering options

---

#### **Features Intentionally Removed for This PR:**

To reduce complexity and review scope, the following features were
temporarily reverted and will be reintroduced in subsequent PRs:

- ❌ Settings pannel with performance metrics overlay
- ❌ Cell selection (single, multiple, and range selections)
- ❌ Keyboard navigation with arrow keys and selection extension
- ❌ Copy functionality supporting CSV, TSV, and Markdown table formats
- ❌ Inline cell editing with file persistence
- ❌ Viewport following for large datasets
- ❌ Column filtering and search capabilities

These removals were done via "time-machine" commits that cleanly nuked
vertical slices of functionality from the complete implementation.

---

**Technical Implementation:**

The feature is organized into a dedicated `csv_preview` crate with the
following structure:

```
crates/csv_preview/
├── src/
│   ├── csv_preview.rs          # Main view and coordination logic
│   ├── parser.rs               # CSV parsing and editor integration
│   ├── settings.rs             # Configuration types and defaults
│   ├── table_data_engine.rs    # Data transformation logic
│   ├── renderer/               # UI rendering modules
│   │   ├── preview_view.rs     # Main render implementation
│   │   ├── render_table.rs     # Table component assembly
│   │   ├── table_cell.rs       # Individual cell rendering
│   │   ├── table_header.rs     # Header with sorting controls
│   │   └── row_identifiers.rs  # Line number column
│   └── types/                  # Core data structures
│       ├── table_like_content.rs
│       ├── coordinates.rs      # Display vs data coordinate systems
│       └── table_cell.rs
```

**Key architectural decisions:**
- **Dual coordinate system**: Separates data indices from display
indices to support sorting/filtering
- **Component reuse**: Leverages existing `data_table` infrastructure
from the keymap editor

---

**Integration:**
- Registers `csv::OpenPreview` action (currently without default
keybindings)
- Follows the same workspace integration pattern as `markdown_preview`
and `svg_preview`
- Automatically detects `.csv` file extensions
- Tab integration with appropriate icons and naming

---

**Code Structure Note:**
Some code structures, types, and documentation may appear redundant or
over-engineered in this initial implementation. This is intentional -
the feature was developed as a complete system and then decomposed by
functionality rather than being built incrementally. The "extra"
infrastructure supports features that were removed for this PR but will
be reintroduced in subsequent ones.

This approach was chosen over extensive refactoring because:
1. The complete feature took 200+ commits to develop with significant
rewrites
2. Clean extraction of vertical slices was more feasible than rebuilding
incrementally
3. The end state will utilize all these components, making current
"redundancy" temporary

I apologize for any inconvenience this may cause during review, but the
alternative would have required significant refactoring effort just to
make intermediate states "prettier," which seemed counterproductive.

---

**Future Work:**
This lays the groundwork for upcoming PRs that will reintroduce the
removed features:
- Cell selection and keyboard navigation
- Copy functionality with multiple output formats
- Inline editing capabilities with undo/redo
- Column filtering and search
- TSV and other delimiter support
- Improved horizontal scrolling behavior
- Settings persistence

**Testing:**
Includes test fixtures demonstrating multiline cell handling, various
column counts, and edge cases.

---

**Release Notes:**

- N/A This is feature flagged

---------

Co-authored-by: Anthony Eid <anthony@zed.dev>

Closes #50569

Before you mark this PR as ready for review, make sure that you have:
- [x] Added a solid test coverage and/or screenshots from doing manual
testing
- [x] Done a self-review taking into account security and performance
aspects
- [x] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Previously, OpenRouter responses containing only usage data (without any
choices) would cause an error. Now the mapper properly emits usage
updates
for these events without failing.

Release Notes:

- Fixed an error when OpenRouter returns a usage-only event with empty
choices.