Security fix for path-traversal attack (#48)

Additionally:

- Make expense and budget modal "reset" once closed, saved, or deleted.
- Make manifest icons dark
- Budgets in small screens should be full-screen
- Minor code cleanup

Fixes #48

components/expenses/ListBudgets.tsx

@@ -102,7 +102,7 @@ export default function ListBudgets(
                 return (
                   <div
                     onClick={() => budget.id === 'total' ? swapView('chart') : onClickEditBudget(budget.id)}
-                    class='flex max-w-sm gap-y-4 gap-x-4 rounded shadow-md bg-slate-700 relative cursor-pointer py-4 px-6 hover:opacity-80'
+                    class='flex w-full md:w-auto max-w-sm gap-y-4 gap-x-4 rounded shadow-md bg-slate-700 relative cursor-pointer py-4 px-6 hover:opacity-80'
                   >
                     <article class='order-first tracking-tight flex flex-col text-base mr-4'>
                       <span class='font-bold text-lg' title='Amount used from budgeted amount'>