Simplify auth, remove abstraction layers, add shadcn components

- Delete lib/api/errors.ts and lib/api/auth-guard.ts, inline
  NextResponse.json() error responses directly in route handlers
- Replace non-standard amber CSS variables with primary/primary-foreground
- Regenerate shadcn UI components with biome-ignore comments
- Add CLAUDE.md for repository guidance
- Update dependencies and pnpm lockfile

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

components/ui/combobox.tsx

@@ -26,11 +26,11 @@ function ComboboxTrigger({
   return (
     <ComboboxPrimitive.Trigger
       data-slot="combobox-trigger"
-      className={cn("[&_svg:not([class*='size-'])]:size-4", className)}
+      className={cn("[&_svg:not([class*='size-'])]:size-3.5", className)}
       {...props}
     >
       {children}
-      <IconChevronDown className="text-muted-foreground pointer-events-none size-4" />
+      <IconChevronDown className="text-muted-foreground pointer-events-none size-3.5" />
     </ComboboxPrimitive.Trigger>
   );
 }
@@ -110,7 +110,7 @@ function ComboboxContent({
           data-slot="combobox-content"
           data-chips={!!anchor}
           className={cn(
-            "bg-popover text-popover-foreground data-open:animate-in data-closed:animate-out data-closed:fade-out-0 data-open:fade-in-0 data-closed:zoom-out-95 data-open:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 ring-foreground/10 *:data-[slot=input-group]:bg-input/30 *:data-[slot=input-group]:border-input/30 data-[side=inline-start]:slide-in-from-right-2 data-[side=inline-end]:slide-in-from-left-2 group/combobox-content relative max-h-(--available-height) w-(--anchor-width) max-w-(--available-width) min-w-[calc(var(--anchor-width)+--spacing(7))] origin-(--transform-origin) overflow-hidden rounded-none shadow-md ring-1 duration-100 data-[chips=true]:min-w-(--anchor-width) *:data-[slot=input-group]:m-1 *:data-[slot=input-group]:mb-0 *:data-[slot=input-group]:h-8 *:data-[slot=input-group]:shadow-none",
+            "bg-popover text-popover-foreground data-open:animate-in data-closed:animate-out data-closed:fade-out-0 data-open:fade-in-0 data-closed:zoom-out-95 data-open:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 ring-foreground/10 *:data-[slot=input-group]:bg-input/20 dark:bg-popover data-[side=inline-start]:slide-in-from-right-2 data-[side=inline-end]:slide-in-from-left-2 group/combobox-content relative max-h-(--available-height) w-(--anchor-width) max-w-(--available-width) min-w-[calc(var(--anchor-width)+--spacing(7))] origin-(--transform-origin) overflow-hidden rounded-lg shadow-md ring-1 duration-100 data-[chips=true]:min-w-(--anchor-width) *:data-[slot=input-group]:m-1 *:data-[slot=input-group]:mb-0 *:data-[slot=input-group]:h-7 *:data-[slot=input-group]:border-none *:data-[slot=input-group]:shadow-none",
             className,
           )}
           {...props}
@@ -125,7 +125,7 @@ function ComboboxList({ className, ...props }: ComboboxPrimitive.List.Props) {
     <ComboboxPrimitive.List
       data-slot="combobox-list"
       className={cn(
-        "no-scrollbar max-h-[min(calc(--spacing(72)---spacing(9)),calc(var(--available-height)---spacing(9)))] scroll-py-1 overflow-y-auto overscroll-contain data-empty:p-0",
+        "no-scrollbar max-h-[min(calc(--spacing(72)---spacing(9)),calc(var(--available-height)---spacing(9)))] scroll-py-1 overflow-y-auto overscroll-contain p-1 data-empty:p-0",
         className,
       )}
       {...props}
@@ -142,7 +142,7 @@ function ComboboxItem({
     <ComboboxPrimitive.Item
       data-slot="combobox-item"
       className={cn(
-        "data-highlighted:bg-accent data-highlighted:text-accent-foreground not-data-[variant=destructive]:data-highlighted:**:text-accent-foreground relative flex w-full cursor-default items-center gap-2 rounded-none py-2 pr-8 pl-2 text-xs outline-hidden select-none data-disabled:pointer-events-none data-disabled:opacity-50 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4",
+        "data-highlighted:bg-accent data-highlighted:text-accent-foreground not-data-[variant=destructive]:data-highlighted:**:text-accent-foreground relative flex min-h-7 w-full cursor-default items-center gap-2 rounded-md px-2 py-1 text-xs/relaxed outline-hidden select-none data-disabled:pointer-events-none data-disabled:opacity-50 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-3.5",
         className,
       )}
       {...props}
@@ -150,7 +150,7 @@ function ComboboxItem({
       {children}
       <ComboboxPrimitive.ItemIndicator
         render={
-          <span className="pointer-events-none absolute right-2 flex size-4 items-center justify-center" />
+          <span className="pointer-events-none absolute right-2 flex items-center justify-center" />
         }
       >
         <IconCheck className="pointer-events-none" />
@@ -176,7 +176,7 @@ function ComboboxLabel({
   return (
     <ComboboxPrimitive.GroupLabel
       data-slot="combobox-label"
-      className={cn("text-muted-foreground px-2 py-2 text-xs", className)}
+      className={cn("text-muted-foreground px-2 py-1.5 text-xs", className)}
       {...props}
     />
   );
@@ -193,7 +193,7 @@ function ComboboxEmpty({ className, ...props }: ComboboxPrimitive.Empty.Props) {
     <ComboboxPrimitive.Empty
       data-slot="combobox-empty"
       className={cn(
-        "text-muted-foreground hidden w-full justify-center py-2 text-center text-xs group-data-empty/combobox-content:flex",
+        "text-muted-foreground hidden w-full justify-center py-2 text-center text-xs/relaxed group-data-empty/combobox-content:flex",
         className,
       )}
       {...props}
@@ -208,7 +208,7 @@ function ComboboxSeparator({
   return (
     <ComboboxPrimitive.Separator
       data-slot="combobox-separator"
-      className={cn("bg-border -mx-1 h-px", className)}
+      className={cn("bg-border/50 -mx-1 my-1 h-px", className)}
       {...props}
     />
   );
@@ -223,7 +223,7 @@ function ComboboxChips({
     <ComboboxPrimitive.Chips
       data-slot="combobox-chips"
       className={cn(
-        "dark:bg-input/30 border-input focus-within:border-ring focus-within:ring-ring/50 has-aria-invalid:ring-destructive/20 dark:has-aria-invalid:ring-destructive/40 has-aria-invalid:border-destructive dark:has-aria-invalid:border-destructive/50 flex min-h-8 flex-wrap items-center gap-1 rounded-none border bg-transparent bg-clip-padding px-2.5 py-1 text-xs transition-colors focus-within:ring-1 has-aria-invalid:ring-1 has-data-[slot=combobox-chip]:px-1",
+        "bg-input/20 dark:bg-input/30 border-input focus-within:border-ring focus-within:ring-ring/30 has-aria-invalid:ring-destructive/20 dark:has-aria-invalid:ring-destructive/40 has-aria-invalid:border-destructive dark:has-aria-invalid:border-destructive/50 flex min-h-7 flex-wrap items-center gap-1 rounded-md border bg-clip-padding px-2 py-0.5 text-xs/relaxed transition-colors focus-within:ring-2 has-aria-invalid:ring-2 has-data-[slot=combobox-chip]:px-1",
         className,
       )}
       {...props}
@@ -243,7 +243,7 @@ function ComboboxChip({
     <ComboboxPrimitive.Chip
       data-slot="combobox-chip"
       className={cn(
-        "bg-muted text-foreground flex h-[calc(--spacing(5.25))] w-fit items-center justify-center gap-1 rounded-none px-1.5 text-xs font-medium whitespace-nowrap has-disabled:pointer-events-none has-disabled:cursor-not-allowed has-disabled:opacity-50 has-data-[slot=combobox-chip-remove]:pr-0",
+        "bg-muted-foreground/10 text-foreground flex h-[calc(--spacing(4.75))] w-fit items-center justify-center gap-1 rounded-[calc(var(--radius-sm)-2px)] px-1.5 text-xs/relaxed font-medium whitespace-nowrap has-disabled:pointer-events-none has-disabled:cursor-not-allowed has-disabled:opacity-50 has-data-[slot=combobox-chip-remove]:pr-0",
         className,
       )}
       {...props}