docs: document helpdesk ticket controls

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

DESIGN.md

@@ -140,6 +140,19 @@ Spacing follows Tailwind's 4px scale. Existing frontend stacks use `gap-1`, `gap
 - **Layout**: the transfer list is a single document scroll region inside the authenticated shell;
   cards use an intrinsic one-column-to-two-column grid and remain readable at narrow widths.
 
+### Helpdesk ticket controls
+
+- **Structure**: ticket list and detail surfaces use the existing `Item`, `Badge`, `Button`, and
+  `Dialog` primitives. The author-only edit dialog contains labeled title, category, priority, and
+  description controls; vote state uses one `Button` with a visible count.
+- **States**: edit controls expose default, pending, success, and error states. Vote controls expose
+  unvoted, voted (`aria-pressed`), pending, and disabled states; canceled tickets disable voting.
+- **Accessibility**: edit dialogs have a title and description, every field has an associated label,
+  and vote buttons announce both the action and count without relying on iconography.
+- **Motion**: use existing shadcn dialog and button transitions only.
+- **Layout**: controls wrap on narrow screens and never turn a card-wide navigation link into a
+  nested interactive target.
+
 ## 6. Motion & Interaction
 
 ### Timing