Add Foundry mobile layout with Tauri iOS/Android support

- Add responsive mobile layout with bottom pill tab bar, swipe navigation, and task list as home screen
- Add platform detection (useIsMobile hook) with viewport breakpoint and VITE_MOBILE build flag
- Mobile-optimize settings/billing/account pages (single-column layout with horizontal tabs)
- Add iOS safe area inset handling with 47px minimum padding
- Scaffold Tauri v2 mobile targets (iOS/Android) with platform-gated sidecar and capabilities
- Add notification sound support and mobile build script

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

foundry/packages/shared/src/app-shell.ts

@@ -10,6 +10,7 @@ export interface FoundryUser {
   name: string;
   email: string;
   githubLogin: string;
+  avatarUrl: string | null;
   roleLabel: string;
   eligibleOrganizationIds: string[];
 }
@@ -20,6 +21,8 @@ export interface FoundryOrganizationMember {
   email: string;
   role: "owner" | "admin" | "member";
   state: "active" | "invited";
+  avatarUrl: string | null;
+  githubLogin: string | null;
 }
 
 export interface FoundryInvoice {

foundry/packages/shared/src/workbench.ts

@@ -76,6 +76,14 @@ export interface WorkbenchPullRequestSummary {
   status: "draft" | "ready";
 }
 
+export interface WorkbenchPresence {
+  memberId: string;
+  name: string;
+  avatarUrl: string | null;
+  lastSeenAtMs: number;
+  typing?: boolean;
+}
+
 export interface WorkbenchTask {
   id: string;
   repoId: string;
@@ -90,6 +98,7 @@ export interface WorkbenchTask {
   diffs: Record<string, string>;
   fileTree: WorkbenchFileTreeNode[];
   minutesUsed: number;
+  presence: WorkbenchPresence[];
 }
 
 export interface WorkbenchRepo {