feat(git): add advanced clone options (shallow, sparse, flags)

Add advanced clone options support across the frontend and backend.
Users can specify a branch, shallow limits, blobless mode, sparse paths,
and custom clone flags when initiating a clone operation. The backend
validates inputs, parses custom flags without invoking a shell, and
configures sparse checkouts after a successful clone. A small parsing
dependency was added and tracked-file parsing was improved to better
handle git ls-files output.

- Introduce CloneRunOptions and validation helpers for clone inputs
- Parse custom flags with a shell-like tokenizer and block managed flags
- Support sparse checkout configuration and shallow clone constraints

src/App.svelte

@@ -148,6 +148,7 @@
     AppLanguage,
     AppTheme,
     AnalyticsSettings,
+    CloneOptions,
     CustomThemeColors,
     ConflictFile,
     DetectedExternalTool,
@@ -233,6 +234,7 @@
     remoteUrl: string;
     parentPath: string;
     directoryName: string;
+    cloneOptions?: CloneOptions;
   }
 
   interface ErrorAutoHideState {
@@ -719,7 +721,7 @@
     if (pendingStartupCloneRequest) {
       const request = pendingStartupCloneRequest;
       pendingStartupCloneRequest = null;
-      await cloneRepo(request.remoteUrl, request.parentPath, request.directoryName);
+      await cloneRepo(request.remoteUrl, request.parentPath, request.directoryName, undefined, undefined, undefined, false, "credentials", request.cloneOptions);
       return;
     }
     const path = pendingStartupRepoPath;
@@ -2462,12 +2464,13 @@
     key?: string | null,
     fromStore = false,
     credentialMode: CredentialMode = "credentials",
+    cloneOptions: CloneOptions = { branch: null, blobless: false, customFlags: "", shallowDepth: null, shallowSince: null, sparse: false, sparsePaths: [] },
   ) {
     if (isBusy) return;
     if (!remoteUrl) { errorMessage = "Enter a remote URL."; return; }
     if (!parentPath) { errorMessage = "Select a destination folder."; return; }
 
-    const request: CloneRequest = { remoteUrl, parentPath, directoryName };
+    const request: CloneRequest = { remoteUrl, parentPath, directoryName, cloneOptions };
     pendingClone = request;
     const credentialKey = key === undefined ? orgKeyFromUrl(remoteUrl) : key;
 
@@ -2483,7 +2486,7 @@
           credDialogOpen = true;
           return;
         }
-        await cloneRepo(remoteUrl, parentPath, directoryName, stored.username, stored.password, credentialKey, true, storedMode);
+        await cloneRepo(remoteUrl, parentPath, directoryName, stored.username, stored.password, credentialKey, true, storedMode, cloneOptions);
         return;
       }
     }
@@ -2499,6 +2502,7 @@
         username,
         password,
         COMMIT_HISTORY_PAGE_SIZE + 1,
+        cloneOptions,
       );
       resetRepositoryState(false);
       await applyRepositoryBundle(bundle.status.repo_path, bundle);
@@ -2555,9 +2559,9 @@
     trackEvent("clone_dialog_opened");
   }
 
-  function cloneFromDialog(remoteUrl: string, parentPath: string, directoryName: string, provider?: GitIntegrationProvider, accountId?: string) {
+  function cloneFromDialog(remoteUrl: string, parentPath: string, directoryName: string, cloneOptions: CloneOptions, provider?: GitIntegrationProvider, accountId?: string) {
     const credentialKey = provider ? integrationCredentialKey(provider, accountId) : undefined;
-    void cloneRepo(remoteUrl, parentPath, directoryName, undefined, undefined, credentialKey, false, provider ? "token" : "credentials");
+    void cloneRepo(remoteUrl, parentPath, directoryName, undefined, undefined, credentialKey, false, provider ? "token" : "credentials", cloneOptions);
   }
 
   function openRepoManagement() {
@@ -3877,6 +3881,7 @@
         key,
         false,
         mode,
+        pendingClone.cloneOptions,
       );
     }
   }