fix: move hidden input off-screen and fix branch loading

- Move terminal hidden input to off-screen position (-9999px) to prevent
  text selection/caret visibility on mobile
- Add user-select: none to prevent any selection UI
- Fix create-session-form to use new listRepositoryBranches API signature
  (projectId, repoId) and access response.branches/default_branch

apps/web/src/components/create-session-form.tsx

@@ -73,19 +73,19 @@ export const CreateSessionForm = ({
 
   // Load branches when selected repo changes
   useEffect(() => {
-    if (!selectedRepo || !showCloneMode) {
+    const projectId = fixedProjectId || selectedProject;
+    if (!selectedRepo || !projectId || !showCloneMode) {
       setBranches([]);
       return;
     }
     const loadBranches = async () => {
       setIsLoadingBranches(true);
       try {
-        const branchList = await listRepositoryBranches(selectedRepo);
-        setBranches(branchList);
-        const defaultBranch = branchList.find((b) => b.is_default);
-        if (defaultBranch) {
-          setBranch(defaultBranch.name);
-          setBaseBranch(defaultBranch.name);
+        const response = await listRepositoryBranches(projectId, selectedRepo);
+        setBranches(response.branches);
+        if (response.default_branch) {
+          setBranch(response.default_branch);
+          setBaseBranch(response.default_branch);
         }
       } catch {
         // ignore
@@ -94,7 +94,7 @@ export const CreateSessionForm = ({
       }
     };
     void loadBranches();
-  }, [selectedRepo, showCloneMode]);
+  }, [selectedRepo, selectedProject, fixedProjectId, showCloneMode]);
 
   // Filter repositories by selected project
   const availableRepos = selectedProject