feat: add workspace account page and mobile app shell

Normalize the UI with shared primitives, add a workspace-backed account surface, and improve authenticated mobile navigation, map behavior, and dashboard browsing.

db/migrations/0002_workspaces.sql

@@ -0,0 +1,59 @@
+create table if not exists public.workspaces (
+  id uuid primary key default gen_random_uuid(),
+  name text not null,
+  workspace_type text not null check (workspace_type in ('personal', 'company')),
+  created_at timestamptz not null default now(),
+  updated_at timestamptz not null default now()
+);
+
+create table if not exists public.workspace_memberships (
+  id uuid primary key default gen_random_uuid(),
+  workspace_id uuid not null references public.workspaces (id) on delete cascade,
+  user_id uuid not null references public.users (id) on delete cascade,
+  role text not null check (role in ('owner', 'admin', 'member')),
+  created_at timestamptz not null default now(),
+  updated_at timestamptz not null default now(),
+  constraint workspace_memberships_workspace_user_key unique (workspace_id, user_id)
+);
+
+create index if not exists workspace_memberships_user_id_idx on public.workspace_memberships (user_id);
+create index if not exists workspace_memberships_workspace_id_idx on public.workspace_memberships (workspace_id);
+
+drop trigger if exists set_workspaces_updated_at on public.workspaces;
+create trigger set_workspaces_updated_at
+before update on public.workspaces
+for each row
+execute function public.set_updated_at();
+
+drop trigger if exists set_workspace_memberships_updated_at on public.workspace_memberships;
+create trigger set_workspace_memberships_updated_at
+before update on public.workspace_memberships
+for each row
+execute function public.set_updated_at();
+
+do $$
+declare
+  workspace_user record;
+  next_workspace_id uuid;
+begin
+  for workspace_user in
+    select u.id, u.email, u.display_name
+    from public.users u
+    where not exists (
+      select 1
+      from public.workspace_memberships wm
+      where wm.user_id = u.id
+    )
+  loop
+    insert into public.workspaces (name, workspace_type)
+    values (
+      concat(coalesce(nullif(workspace_user.display_name, ''), split_part(workspace_user.email, '@', 1), 'User'), '''s Workspace'),
+      'personal'
+    )
+    returning id into next_workspace_id;
+
+    insert into public.workspace_memberships (workspace_id, user_id, role)
+    values (next_workspace_id, workspace_user.id, 'owner');
+  end loop;
+end
+$$;