add some UI code for the new branch listing command

app/src/lib/branches/branchListing.ts

@@ -0,0 +1,80 @@
+import { invoke } from '$lib/backend/ipc';
+import { plainToInstance } from 'class-transformer';
+
+export class BranchListingService {
+	constructor(private projectId: string) {}
+	async list() {
+		try {
+			const branches = plainToInstance(
+				BranchListing,
+				await invoke<any[]>('list_branches', { projectId: this.projectId })
+			);
+			console.log(branches);
+			return branches;
+		} catch (err: any) {
+			console.error(err);
+		}
+	}
+}
+
+/// Represents a branch that exists for the repository
+/// This also combines the concept of a remote, local and virtual branch in order to provide a unified interface for the UI
+/// Branch entry is not meant to contain all of the data a branch can have (e.g. full commit history, all files and diffs, etc.).
+/// It is intended a summary that can be quickly retrieved and displayed in the UI.
+/// For more detailed information, each branch can be queried individually for it's `BranchData`.
+export class BranchListing {
+	/// The name of the branch (e.g. `main`, `feature/branch`), excluding the remote name
+	name!: string;
+	/// This is a list of remote that this branch can be found on (e.g. `origin`, `upstream` etc.).
+	/// If this branch is a local branch, this list will be empty.
+	remotes!: string[];
+	/// The branch may or may not have a virtual branch associated with it
+	virtual_branch?: VirtualBranchReference | undefined;
+	/// The number of lines added within the branch
+	/// Since the virtual branch, local branch and the remote one can have different number of lines removed,
+	/// the value from the virtual branch (if present) takes the highest precedence,
+	/// followed by the local branch and then the remote branches (taking the max if there are multiple)
+	lines_added!: number;
+	/// The number of lines removed within the branch
+	/// Since the virtual branch, local branch and the remote one can have different number of lines removed,
+	/// the value from the virtual branch (if present) takes the highest precedence,
+	/// followed by the local branch and then the remote branches (taking the max if there are multiple)
+	lines_removed!: number;
+	/// The number of files that were modified within the branch
+	/// Since the virtual branch, local branch and the remote one can have different number files modified,
+	/// the value from the virtual branch (if present) takes the highest precedence,
+	/// followed by the local branch and then the remote branches (taking the max if there are multiple)
+	number_of_files!: number;
+	/// The number of commits associated with a branch
+	/// Since the virtual branch, local branch and the remote one can have different number of commits,
+	/// the value from the virtual branch (if present) takes the highest precedence,
+	/// followed by the local branch and then the remote branches (taking the max if there are multiple)
+	number_of_commits!: number;
+	/// Timestamp in milliseconds since the branch was last updated.
+	/// This includes any commits, uncommited changes or even updates to the branch metadata (e.g. renaming).
+	updated_at!: number;
+	/// A list of authors that have contributes commits to this branch.
+	/// In the case of multiple remote tracking branches, it takes the full list of unique authors.
+	authors!: Author[];
+	/// Determines if the branch is considered one created by the user
+	/// A branch is considered created by the user if they were the author of the first commit in the branch.
+	own_branch!: boolean;
+}
+
+/// Represents a reference to an associated virtual branch
+export class VirtualBranchReference {
+	/// A non-normalized name of the branch, set by the user
+	given_name!: string;
+	/// Virtual Branch UUID identifier
+	id!: string;
+	/// Determines if the virtual branch is applied in the workspace
+	in_workspace!: boolean;
+}
+
+/// Represents a "commit author" or "signature", based on the data from ther git history
+export class Author {
+	/// The name of the author as configured in the git config
+	name?: string | undefined;
+	/// The email of the author as configured in the git config
+	email?: string | undefined;
+}