feat: shared backlog filter popover + sprint header polish (v1.3.3) (#184)

- Move sprint switcher into sprint header, centered between title and actions
- Extract BacklogFilterPopover as shared component used by sprint and product backlog
- Add sort options (code/priority/status) with single-pill asc/desc toggle
- Default sprint backlog status filter to OPEN, remove "alleen niet klaar" button
- Persist collapsed state and filter popover open in localStorage
- Fix hydration flicker: defer localStorage read to useEffect with prefsLoaded gate for writes
- Increase sprint switcher text size for readability

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

components/shared/backlog-filter-popover.tsx

@@ -0,0 +1,186 @@
+'use client'
+
+import { ArrowDown, ArrowUp } from 'lucide-react'
+import { Button } from '@/components/ui/button'
+import { Popover, PopoverContent, PopoverTrigger } from '@/components/ui/popover'
+import { cn } from '@/lib/utils'
+import { debugProps } from '@/lib/debug'
+
+export const PRIORITY_LABELS: Record<number, string> = {
+  1: 'Kritiek',
+  2: 'Hoog',
+  3: 'Gemiddeld',
+  4: 'Laag',
+}
+
+export const PRIORITY_OPTIONS: Array<{ value: number | 'all'; label: string }> = [
+  { value: 'all', label: 'Alle' },
+  { value: 1, label: 'Kritiek' },
+  { value: 2, label: 'Hoog' },
+  { value: 3, label: 'Gemiddeld' },
+  { value: 4, label: 'Laag' },
+]
+
+export type SortDir = 'asc' | 'desc'
+
+export function FilterPills<T extends string | number>({
+  label,
+  options,
+  value,
+  onChange,
+}: {
+  label: string
+  options: Array<{ value: T; label: string }>
+  value: T
+  onChange: (v: T) => void
+}) {
+  return (
+    <div className="space-y-1.5">
+      <p className="text-xs font-medium text-muted-foreground">{label}</p>
+      <div className="flex flex-wrap gap-1.5">
+        {options.map((opt) => (
+          <button
+            key={String(opt.value)}
+            type="button"
+            onClick={() => onChange(opt.value)}
+            className={cn(
+              'text-xs px-2.5 py-1 rounded-full border transition-colors',
+              value === opt.value
+                ? 'bg-primary text-primary-foreground border-primary'
+                : 'bg-transparent border-border hover:bg-surface-container'
+            )}
+          >
+            {opt.label}
+          </button>
+        ))}
+      </div>
+    </div>
+  )
+}
+
+interface BacklogFilterPopoverProps<S extends string, So extends string> {
+  open: boolean
+  onOpenChange: (open: boolean) => void
+
+  filterPriority: number | 'all'
+  onFilterPriorityChange: (v: number | 'all') => void
+
+  filterStatus: S
+  onFilterStatusChange: (v: S) => void
+  statusOptions: Array<{ value: S; label: string }>
+
+  sort: So
+  onSortChange: (v: So) => void
+  sortDir: SortDir
+  onSortDirChange: (v: SortDir) => void
+  sortOptions: Array<{ value: So; label: string }>
+
+  activeFilterCount: number
+  onReset: () => void
+  resetDisabled: boolean
+}
+
+export function BacklogFilterPopover<S extends string, So extends string>({
+  open,
+  onOpenChange,
+  filterPriority,
+  onFilterPriorityChange,
+  filterStatus,
+  onFilterStatusChange,
+  statusOptions,
+  sort,
+  onSortChange,
+  sortDir,
+  onSortDirChange,
+  sortOptions,
+  activeFilterCount,
+  onReset,
+  resetDisabled,
+}: BacklogFilterPopoverProps<S, So>) {
+  return (
+    <Popover open={open} onOpenChange={onOpenChange}>
+      <PopoverTrigger
+        render={
+          <Button
+            variant="outline"
+            size="sm"
+            className="h-7 text-xs"
+            {...debugProps('backlog-filter-popover__trigger')}
+          >
+            {`Filters${activeFilterCount > 0 ? ` (${activeFilterCount})` : ''}`}
+          </Button>
+        }
+      />
+      <PopoverContent
+        align="end"
+        className="w-72 space-y-4"
+        {...debugProps('backlog-filter-popover', 'BacklogFilterPopover', 'components/shared/backlog-filter-popover.tsx')}
+      >
+        <FilterPills
+          label="Prioriteit"
+          options={PRIORITY_OPTIONS}
+          value={filterPriority}
+          onChange={onFilterPriorityChange}
+        />
+        <FilterPills
+          label="Status"
+          options={statusOptions}
+          value={filterStatus}
+          onChange={onFilterStatusChange}
+        />
+        <div className="space-y-1.5">
+          <p className="text-xs font-medium text-muted-foreground">Sorteren op</p>
+          <div className="flex flex-wrap gap-1.5">
+            {sortOptions.map((opt) => {
+              const active = sort === opt.value
+              return (
+                <button
+                  key={opt.value}
+                  type="button"
+                  onClick={() => {
+                    if (active) {
+                      onSortDirChange(sortDir === 'asc' ? 'desc' : 'asc')
+                    } else {
+                      onSortChange(opt.value)
+                      onSortDirChange('asc')
+                    }
+                  }}
+                  aria-label={
+                    active
+                      ? `Sorteren op ${opt.label} ${sortDir === 'asc' ? 'oplopend' : 'aflopend'} — klik om te wisselen`
+                      : `Sorteren op ${opt.label}`
+                  }
+                  className={cn(
+                    'inline-flex items-center gap-1 text-xs px-2.5 py-1 rounded-full border transition-colors',
+                    active
+                      ? 'bg-primary text-primary-foreground border-primary'
+                      : 'bg-transparent border-border hover:bg-surface-container'
+                  )}
+                >
+                  <span>{opt.label}</span>
+                  {active && (
+                    sortDir === 'asc'
+                      ? <ArrowDown size={12} aria-hidden />
+                      : <ArrowUp size={12} aria-hidden />
+                  )}
+                </button>
+              )
+            })}
+          </div>
+        </div>
+        <div className="flex justify-end pt-1 border-t border-border">
+          <Button
+            type="button"
+            variant="ghost"
+            size="sm"
+            className="h-7 text-xs"
+            disabled={resetDisabled}
+            onClick={onReset}
+          >
+            Wis filters
+          </Button>
+        </div>
+      </PopoverContent>
+    </Popover>
+  )
+}