feat: workspace-first UI refresh - PR-2 workspace detail page

- Add workspace detail page (/workspaces/:id) with 4 tabs:
  - Files: file tree, viewer, editor, git toolbar (commit/push/pull/fetch)
  - Git: branch selector, commit history
  - Tools: instance grid, start tool modal
  - Settings: workspace info read-only
- Add workspace API clients: workspace-files, workspace-git, workspace-instances
- Add hooks: useWorkspaceFiles, useWorkspaceGit, useWorkspaceInstances
- WorkspaceCard links to detail page via router Link
- Add comprehensive CSS for workspace detail layout
- Mobile: bottom tab bar, responsive file tree/split
- TypeScript + eslint clean

Quality gates: tsc --noEmit clean, eslint clean

apps/api/src/api/projects.py

@@ -7,7 +7,12 @@ from pydantic import BaseModel, ConfigDict
 from sqlalchemy import func, select
 from sqlalchemy.ext.asyncio import AsyncSession
 
-from src.auth.dependencies import _get_owned_project, _get_user, get_current_user_id, get_db_session
+from src.auth.dependencies import (
+    _get_owned_project,
+    _get_user,
+    get_current_user_id,
+    get_db_session,
+)
 from src.models.git_repository import GitRepository
 from src.models.project import Project
 from src.models.ssh_key import SSHKey
@@ -90,7 +95,9 @@ async def list_projects(
     """
     user = await _get_user(session, user_id)
     result = await session.execute(
-        select(Project).where(Project.owner_id == user.id).order_by(Project.created_at.desc())
+        select(Project)
+        .where(Project.owner_id == user.id)
+        .order_by(Project.created_at.desc())
     )
     projects = result.scalars().all()
 
@@ -113,29 +120,37 @@ async def list_projects(
                     select(func.count()).where(ToolInstance.workspace_id == ws.id)
                 )
                 instance_count = inst_result.scalar() or 0
-                workspaces.append({
-                    "id": str(ws.id),
-                    "name": ws.name,
-                    "branch": ws.branch,
-                    "status": ws.status,
-                    "instance_count": instance_count,
-                })
+                workspaces.append(
+                    {
+                        "id": str(ws.id),
+                        "name": ws.name,
+                        "branch": ws.branch,
+                        "status": ws.status,
+                        "instance_count": instance_count,
+                    }
+                )
 
-            repositories.append({
-                "id": str(repo.id),
-                "name": repo.name,
-                "remote_url": repo.remote_url,
-                "workspaces": workspaces,
-            })
+            repositories.append(
+                {
+                    "id": str(repo.id),
+                    "name": repo.name,
+                    "remote_url": repo.remote_url,
+                    "workspaces": workspaces,
+                }
+            )
 
-        enriched.append({
-            "id": str(project.id),
-            "name": project.name,
-            "description": project.description,
-            "owner_id": str(project.owner_id),
-            "repositories": repositories,
-            "created_at": project.created_at.isoformat() if project.created_at else None,
-        })
+        enriched.append(
+            {
+                "id": str(project.id),
+                "name": project.name,
+                "description": project.description,
+                "owner_id": str(project.owner_id),
+                "repositories": repositories,
+                "created_at": project.created_at.isoformat()
+                if project.created_at
+                else None,
+            }
+        )
 
     return enriched
 
@@ -226,7 +241,9 @@ async def delete_project(
     project = await _get_owned_project(project_id, user_id, session)
 
     # Delete repositories from disk and database
-    result = await session.execute(select(GitRepository).where(GitRepository.project_id == project_id))
+    result = await session.execute(
+        select(GitRepository).where(GitRepository.project_id == project_id)
+    )
     repositories = result.scalars().all()
     for repo in repositories:
         if os.path.exists(repo.path):