fix(web): allow returning home from questionnaires

Keep the shared dialog and submitted answers while leaving the focus screen. Remove the history trap and wire the text-step home action.

Refs #85

web/src/content/ru.ts

@@ -204,6 +204,7 @@ export const ru = {
     toIntake: "Пройти первичный опрос",
   },
   flow: {
+    home: "На главный экран",
     question: (n: number, total: number) => `Вопрос ${n} из ${total}`,
     period: "За последний месяц",
     textPlaceholder: "Напишите несколько слов",

web/src/screens/Flow.tsx

@@ -265,7 +265,7 @@ function FreeText({
             {skip.label}
           </button>
         ) : (
-          <button type="button" className="btn btn--ghost" onClick={onExit}>
+          <button type="button" className="btn btn--ghost" disabled={busy} onClick={onExit}>
             {ru.flow.exit}
           </button>
         )}
@@ -362,6 +362,7 @@ function SurveyAct({
   press,
   say,
   onPause,
+  onHome,
 }: {
   step: Survey;
   stepKey: string;
@@ -369,6 +370,7 @@ function SurveyAct({
   press: (b: DialogButton) => void;
   say: (text: string) => void;
   onPause: (b: DialogButton) => void;
+  onHome: () => void;
 }) {
   let answer: ReactNode;
   switch (step.input) {
@@ -381,7 +383,7 @@ function SurveyAct({
       break;
     case "text":
       answer = (
-        <FreeText key={stepKey} skip={step.skip} busy={busy} onSend={say} onSkip={press} onExit={() => undefined} />
+        <FreeText key={stepKey} skip={step.skip} busy={busy} onSend={say} onSkip={press} onExit={onHome} />
       );
       break;
     default:
@@ -522,17 +524,6 @@ export function Flow() {
     navigate("/today", { replace: true });
   }, [step, stepKey, navigate, toast]);
 
-  // Questionnaire: answers are saved on the server per question, and there is no going back to change one.
-  // The browser «back» is absorbed by a duplicate history entry of this same screen.
-  const testing = step?.kind === "survey" || step?.kind === "choice" || step?.kind === "consent";
-  useEffect(() => {
-    if (!testing) return;
-    window.history.pushState(null, "", window.location.href);
-    const stay = () => window.history.pushState(null, "", window.location.href);
-    window.addEventListener("popstate", stay);
-    return () => window.removeEventListener("popstate", stay);
-  }, [testing]);
-
   const press = (b: DialogButton) => void dialog.send({ type: "button", button: b.data }, b.label);
   // «Продолжить позже»: answers are already saved on the server — pause and go straight home, no confirmation.
   const pause = (b: DialogButton) =>
@@ -588,7 +579,7 @@ export function Flow() {
       ) : item ? (
         <Progress n={item.index} total={item.total} adaptive={item.adaptive} />
       ) : null;
-    const top = <TopBar onBack={testing ? undefined : home}>{progress}</TopBar>;
+    const top = progress ? <TopBar>{progress}</TopBar> : null;
     // Phone: one column. Desktop: question and context on the left, answers and actions on the right.
     let lead: ReactNode;
     let act: ReactNode;
@@ -702,7 +693,7 @@ export function Flow() {
         break;
       case "survey":
         lead = <SurveyLead step={step} catalog={catalog} />;
-        act = <SurveyAct step={step} stepKey={stepKey} busy={dialog.busy} press={press} say={say} onPause={pause} />;
+        act = <SurveyAct step={step} stepKey={stepKey} busy={dialog.busy} press={press} say={say} onPause={pause} onHome={home} />;
         break;
       case "choice":
         lead = <Head title={step.title} lead={step.lead} />;
@@ -725,6 +716,14 @@ export function Flow() {
 
   return (
     <AppShell focus bare sos={step?.kind !== "crisis"}>
+      <nav className="flow-nav" aria-label={ru.flow.home}>
+        {/* Leaving does not send an answer or clear pending: Today can reopen this same question.
+            Wait for an in-flight answer before leaving so its result has reached the shared dialog. */}
+        <button type="button" className="btn btn--ghost btn--auto" disabled={dialog.busy} onClick={home}>
+          <Icon name="home" size={20} />
+          {ru.flow.home}
+        </button>
+      </nav>
       {content}
     </AppShell>
   );