git_ui: New panel design (#25821)

This PR updates the ui of the git panel. It removes the header from the
panel and unifies the repository, branch and commit controls in the
bottom section.

It also adds a secondary menu to the primary button giving access to a
variety of actions for managing local and remote changes:

![CleanShot 2025-02-28 at 12 18
15@2x](https://github.com/user-attachments/assets/0260c122-405f-46fc-8cc8-d6beac782b9d)

Known issues (will be fixed in a later pr)
- Spinner showing git operation progress was removed, will be re-added
- Clicking expand with the panel editor focused will commit (due to
shared action name. Already tracked)

Before | After

![CleanShot 2025-02-28 at 12 22
18@2x](https://github.com/user-attachments/assets/4c1e4ac9-b975-487f-bf4e-8815a8da4f4f)

(Also adds `component`, `linkme` to cargo-machete ignore as they are
used in the `IntoComponent` proc-macro and will always be incorrectly
flagged as unused)

Release Notes:

- N/A

---------

Co-authored-by: Cole Miller <m@cole-miller.net>
Co-authored-by: Cole Miller <53574922+cole-miller@users.noreply.github.com>
Co-authored-by: Cole Miller <cole@zed.dev>

crates/git_ui/Cargo.toml

@@ -20,6 +20,7 @@ test-support = ["multi_buffer/test-support"]
 anyhow.workspace = true
 buffer_diff.workspace = true
 collections.workspace = true
+component.workspace = true
 db.workspace = true
 editor.workspace = true
 feature_flags.workspace = true
@@ -29,6 +30,7 @@ git.workspace = true
 gpui.workspace = true
 itertools.workspace = true
 language.workspace = true
+linkme.workspace = true
 menu.workspace = true
 multi_buffer.workspace = true
 panel.workspace = true
@@ -40,6 +42,7 @@ serde.workspace = true
 serde_derive.workspace = true
 serde_json.workspace = true
 settings.workspace = true
+smallvec.workspace = true
 strum.workspace = true
 theme.workspace = true
 time.workspace = true

crates/git_ui/src/commit_modal.rs

@@ -2,7 +2,7 @@
 
 use crate::branch_picker::{self, BranchList};
 use crate::git_panel::{commit_message_editor, GitPanel};
-use git::Commit;
+use git::{Commit, ExpandCommitEditor};
 use panel::{panel_button, panel_editor_style, panel_filled_button};
 use project::Project;
 use ui::{prelude::*, KeybindingHint, PopoverButton, Tooltip, TriggerablePopover};
@@ -110,14 +110,17 @@ struct RestoreDock {
 
 impl CommitModal {
     pub fn register(workspace: &mut Workspace, _: &mut Window, _cx: &mut Context<Workspace>) {
-        workspace.register_action(|workspace, _: &Commit, window, cx| {
+        workspace.register_action(|workspace, _: &ExpandCommitEditor, window, cx| {
             let Some(git_panel) = workspace.panel::<GitPanel>(cx) else {
                 return;
             };
 
-            let (can_commit, conflict) = git_panel.update(cx, |git_panel, _cx| {
+            let (can_commit, conflict) = git_panel.update(cx, |git_panel, cx| {
                 let can_commit = git_panel.can_commit();
                 let conflict = git_panel.has_unstaged_conflicts();
+                if can_commit {
+                    git_panel.set_modal_open(true, cx);
+                }
                 (can_commit, conflict)
             });
             if !can_commit {
@@ -131,6 +134,7 @@ impl CommitModal {
                     prompt.await.ok();
                 })
                 .detach();
+                return;
             }
 
             let dock = workspace.dock_at_position(git_panel.position(window, cx));