fix: crash bugs in TeamInvoices + faster load

Bug fixes:
- TeamInvoices: add useAuth import/currentUser (invoice-create crash)
- TeamInvoices: setChartYear -> setExportYear (year-dropdown crash)
- TeamDashboard: drop redundant setState-in-effect (cascading renders)
- Companies: delete dead _UnusedClientCompanies (illegal hook calls)
- annotate intentional empty PDF-fallback catches

Load speed:
- preconnect/dns-prefetch to Supabase origin
- lazy-load heic-to in Converters: page chunk 2737KB -> 9KB
- split recharts into its own 'charts' vendor chunk

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

supabase/schema.sql

@@ -67,6 +67,9 @@ create table public.submissions (
   invoiced boolean not null default false,
   is_hot boolean not null default false,
   service_type text default '',
+  sign_count integer,
+  sign_family text default '',
+  signs jsonb not null default '[]'::jsonb,
   deadline date,
   description text default '',
   submitted_by uuid references public.profiles(id) on delete set null,
@@ -280,17 +283,20 @@ alter table public.fourge_passwords enable row level security;
 create or replace function public.get_my_role()
 returns text as $$
   select role from public.profiles where id = auth.uid();
-$$ language sql security definer stable;
+$$ language sql security definer stable
+set search_path = public;
 
 create or replace function public.is_external()
 returns boolean as $$
   select get_my_role() = 'external';
-$$ language sql security definer stable;
+$$ language sql security definer stable
+set search_path = public;
 
 create or replace function public.get_my_company_id()
 returns uuid as $$
   select company_id from public.profiles where id = auth.uid();
-$$ language sql security definer stable;
+$$ language sql security definer stable
+set search_path = public;
 
 create or replace function public.get_database_size_bytes()
 returns bigint as $$
@@ -326,7 +332,10 @@ begin
 
   return new;
 end;
-$$ language plpgsql security definer;
+$$ language plpgsql security definer
+set search_path = public;
+set search_path = public;
+set search_path = public;
 
 create trigger guard_task_update
   before update on public.tasks
@@ -647,7 +656,8 @@ begin
   );
   return new;
 end;
-$$ language plpgsql security definer;
+$$ language plpgsql security definer
+set search_path = public;
 
 create trigger on_auth_user_created
   after insert on auth.users