feat: mobile UX improvements across dashboard (#9)

* feat: mobile UX improvements across dashboard pages

- Responsive layouts with stacked mobile forms and grid desktop views
- Safe area handling (viewportFit cover, bottom nav insets, main padding)
- Touch-friendly dialogs, tabs, and page headers
- Mobile nav drawer open/close animation
- Dashboard layout parallel Supabase queries
- SIE parser: handle quoted VER/TRANS fields
- Skip account override for template-based transaction booking

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: address PR review feedback from Greptile

- Fix nav drawer close timer race condition with useRef + clearTimeout
- Show locked VAT rate as read-only label on mobile instead of hiding it
- Remove dead bottom-16 class overridden by inline style

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

components/import/BankFileColumnMappingStep.tsx

@@ -79,7 +79,7 @@ export default function BankFileColumnMappingStep({
         </CardHeader>
         <CardContent className="space-y-6">
           {/* Delimiter and decimal settings */}
-          <div className="grid grid-cols-2 gap-4">
+          <div className="grid grid-cols-1 sm:grid-cols-2 gap-4">
             <div className="space-y-2">
               <Label>Avgränsare</Label>
               <Select value={delimiter} onValueChange={setDelimiter}>
@@ -110,7 +110,7 @@ export default function BankFileColumnMappingStep({
           {/* Required column mappings */}
           <div>
             <h3 className="text-sm font-medium mb-3">Obligatoriska kolumner</h3>
-            <div className="grid grid-cols-3 gap-4">
+            <div className="grid grid-cols-1 sm:grid-cols-3 gap-4">
               <div className="space-y-2">
                 <Label>Datum *</Label>
                 <Select
@@ -173,7 +173,7 @@ export default function BankFileColumnMappingStep({
           {/* Optional column mappings */}
           <div>
             <h3 className="text-sm font-medium mb-3">Valfria kolumner</h3>
-            <div className="grid grid-cols-3 gap-4">
+            <div className="grid grid-cols-1 sm:grid-cols-3 gap-4">
               <div className="space-y-2">
                 <Label>Referens/OCR</Label>
                 <Select