Add in-progress state to tasks

Introduce IN_PROGRESS as a new task state between TODO and DONE across
the full stack: database enum, Go backend, GraphQL, MCP, and frontend.

The task state icon now cycles forward on click (TODO → IN_PROGRESS →
DONE → TODO), and the action dropdown provides explicit "Move to"
options for any state transition. The "All" tab supports drag-and-drop
between state sections to change a task's state.

Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>

packages/ui/src/Atoms/Icons/TaskStateIcon.stories.tsx

@@ -30,6 +30,12 @@ export const Default: Story = {
   },
 };
 
+export const InProgress: Story = {
+  args: {
+    state: "IN_PROGRESS",
+  },
+};
+
 export const Done: Story = {
   args: {
     state: "DONE",

packages/ui/src/Atoms/Icons/TaskStateIcon.tsx

@@ -12,19 +12,21 @@
 // OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 // PERFORMANCE OF THIS SOFTWARE.
 
+import { IconCircleCheck } from "./IconCircleCheck";
 import { IconCircleProgress } from "./IconCircleProgress";
 import { IconRadioUnchecked } from "./IconRadioUnchecked";
 
 type Props = {
-  state: "TODO" | "DONE";
+  state: "TODO" | "IN_PROGRESS" | "DONE";
 };
 
 export function TaskStateIcon({ state }: Props) {
-  return state === "TODO"
-    ? (
-        <IconRadioUnchecked size={16} className="text-txt-quaternary" />
-      )
-    : (
-        <IconCircleProgress size={16} className="text-txt-accent" />
-      );
+  switch (state) {
+    case "TODO":
+      return <IconRadioUnchecked size={16} className="text-txt-quaternary" />;
+    case "IN_PROGRESS":
+      return <IconCircleProgress size={16} className="text-txt-warning" />;
+    case "DONE":
+      return <IconCircleCheck size={16} className="text-txt-accent" />;
+  }
 }