FN-8123: add agent clarification notifications

Add agent clarification notices with ntfy delivery and mailbox support.

- Add configurable clarification ntfy topics and notification settings
- Route agent clarification requests to ntfy and the planning mailbox
- Update planning dialogs, translations, documentation, and regression tests

Files changed:
 .changeset/fn-8123-agent-clarification.md          |   7 +
 docs/dashboard-guide.md                            |   6 +
 docs/settings-reference.md                         |   1 +
 .../core/src/__tests__/global-settings.test.ts     |  11 +
 packages/core/src/settings-schema.ts               |   2 +
 packages/core/src/types.ts                         |   6 +
 .../app/__tests__/settings-save-split.test.ts      |  13 ++
 packages/dashboard/app/api/legacy.ts               |   3 +-
 .../dashboard/app/components/PlanningModeModal.tsx |  29 ++-
 .../dashboard/app/components/SettingsModal.tsx     |   1 +
 .../__tests__/PlanningModeModal.initial.test.tsx   |  17 +-
 .../app/components/settings/save-split.ts          |   1 +
 .../settings/sections/NotificationsSection.tsx     |  11 +
 .../src/__tests__/routes-planning.test.ts          |   7 +-
 packages/dashboard/src/planning.ts                 | 228 ++++++++++++++++-----
 .../src/routes/register-planning-subtask-routes.ts |  59 +++++-
 packages/i18n/locales/en/app.json                  |   4 +
 packages/i18n/src/resources.d.ts                   |   4 +
 18 files changed, 346 insertions(+), 64 deletions(-)

Fusion-Task-Id: FN-8123

Fusion-Task-Lineage: cf397749-01c6-44d6-8d12-8ce7f5627c29

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

packages/dashboard/app/api/legacy.ts

@@ -3384,7 +3384,7 @@ export function startPlanningStreaming(
   initialPlan: string,
   projectId?: string,
   modelOverride?: { planningModelProvider?: string; planningModelId?: string; thinkingLevel?: ThinkingLevel },
-  planningOptions?: { planningDepth?: "small" | "medium" | "large"; customQuestionCount?: number },
+  planningOptions?: { planningDepth?: "small" | "medium" | "large"; customQuestionCount?: number; clarificationEnabled?: boolean },
   existingSessionId?: string,
 ): Promise<{ sessionId: string }> {
   return api<{ sessionId: string }>(withProjectId("/planning/start-streaming", projectId), {
@@ -3396,6 +3396,7 @@ export function startPlanningStreaming(
       thinkingLevel: modelOverride?.thinkingLevel,
       planningDepth: planningOptions?.planningDepth,
       customQuestionCount: planningOptions?.customQuestionCount,
+      clarificationEnabled: planningOptions?.clarificationEnabled,
       ...(existingSessionId ? { existingSessionId } : {}),
     }),
   });