fix: improve kanban board filtering (#919)

- Render only the selected status column when status chips are active
- Add status color treatments and default assignee normalization
- Reuse profile avatars for Kanban card assignee tags
- Cover status filtering, default assignee labels, and avatar rendering

packages/client/src/utils/hermes/kanban-assignees.ts

@@ -0,0 +1,27 @@
+export const DEFAULT_KANBAN_ASSIGNEE = 'default'
+
+export interface KanbanAssigneeSummary {
+  name: string
+  counts?: Record<string, number> | null
+}
+
+export function assigneeTaskTotal(assignee: KanbanAssigneeSummary): number {
+  return Object.values(assignee.counts || {}).reduce((sum, count) => sum + count, 0)
+}
+
+export function withDefaultAssignee<T extends KanbanAssigneeSummary>(
+  assignees: T[],
+  byAssignee: Record<string, number> = {},
+): KanbanAssigneeSummary[] {
+  const defaultCount = byAssignee[DEFAULT_KANBAN_ASSIGNEE] || 0
+  const hasDefault = assignees.some(assignee => assignee.name === DEFAULT_KANBAN_ASSIGNEE)
+  const normalized = assignees.map(assignee => {
+    if (assignee.name !== DEFAULT_KANBAN_ASSIGNEE || assignee.counts) return assignee
+    return { ...assignee, counts: { total: defaultCount } }
+  })
+  if (hasDefault) return normalized
+  return [
+    { name: DEFAULT_KANBAN_ASSIGNEE, counts: { total: defaultCount } },
+    ...normalized,
+  ]
+}