UI-Fixes: Wizard konsistent, Tabs uebersetzt/responsive, Set-Zeilen, leere Sets

- Setup-Wizard: feste Mindesthoehe (#setup-gate), Navigation unten
  verankert -> Hoehe springt nicht mehr zwischen den Schritten
- Wizard Benutzer-Anlage: nach Erfolg Bestaetigung statt leerem Formular
  (kein erneutes Eingeben), 'Weiter' aktiv
- Tabs: Labels werden uebersetzt (t()-i18n), Topbar/Tabs horizontal
  scrollbar + kompakter auf Mobil -> 'Einstellungen' wird nicht mehr
  abgeschnitten
- Button-Min-Breite (.btn 96px, .btn-small 64px) fuer Sprach-Konsistenz
- Fortschrittssegmente: bei weissem Akzent auf hellem Theme schwarz
  (statt unsichtbar weiss)
- Set-Zeile: eine horizontale Reihe (nowrap) mit einheitlicher
  Eingabe-Mindestbreite/-hoehe; Grid-Spalten auf 460px angepasst
- Leere Saetze (ohne Gewicht UND Reps) werden nicht mehr persistiert und
  im Verlauf ausgeblendet (kein 'empty kg x empty reps'-Wand)
- Tests: 158 Checks gruen (39+18+43+32+26)

app.js

@@ -152,6 +152,7 @@ const LANG = {
     reorder_hint: "Übungen per Ziehen sortieren",
     prev_week: "Vorige Woche", next_week: "Nächste Woche", week_of: "Woche vom",
     wizard_done: "Alles erledigt - die App ist bereit.",
+    wizard_user_created: "Benutzer '{u}' angelegt. Weiter mit 'Weiter'.",
     logged_in: "Angemeldet.", user_created_toast: "Benutzer angelegt.",
     app_load_fail: "App konnte nicht geladen werden: {m}",
   },
@@ -261,6 +262,7 @@ const LANG = {
     reorder_hint: "Drag to reorder exercises",
     prev_week: "Previous week", next_week: "Next week", week_of: "Week of",
     wizard_done: "All done - the app is ready.",
+    wizard_user_created: "User '{u}' created. Continue with 'Next'.",
     logged_in: "Logged in.", user_created_toast: "User created.",
     app_load_fail: "Could not load the app: {m}",
   },
@@ -1033,7 +1035,7 @@ async function flushAutosave(activity) {
       const sets = (model.exercises[exKey] || []).map((e, i) => ({
         exercise: exKey, sort: i, weight: e.weight || "", reps: e.reps || "",
         done: e.done ? 1 : 0,
-      }));
+      })).filter(s => s.weight !== "" || s.reps !== "");
       try {
         await api("/api/sessions/" + model.id, jsonOpts("PATCH", { sets }));
         model.dirtyEx.delete(exKey);
@@ -1262,9 +1264,11 @@ function renderSetSummary(s, a) {
   for (const e of s.entries || []) (byEx[e.exercise] = byEx[e.exercise] || []).push(e);
   for (const exKey of Object.keys(byEx)) {
     const li = el("li", "hist-entry");
+    const sorted = byEx[exKey].sort((x, y) => x.sort - y.sort)
+      .filter(e => e.weight || e.reps);
+    if (!sorted.length) continue;
     li.appendChild(el("span", "ex-name", exKey + ": "));
     const setsWrap = el("span", "hist-sets");
-    const sorted = byEx[exKey].sort((x, y) => x.sort - y.sort);
     sorted.forEach((e, idx) => {
       const w = e.weight || t("empty_label");
       const r = e.reps || t("empty_label");
@@ -1751,6 +1755,11 @@ function renderWizardStep() {
     grid.appendChild(solo);
     box.appendChild(grid);
     if (wizard.multi === true) {
+      if (wizard.userCreated && app.me && app.me.username) {
+        const ok = el("div", "auth-register",
+          t("wizard_user_created", { u: app.me.username }));
+        box.appendChild(ok);
+      } else {
         const form = el("form", "auth-form");
         form.appendChild(authField(t("username"), "setup-user"));
         form.appendChild(authField(t("password"), "setup-pass"));
@@ -1766,6 +1775,7 @@ function renderWizardStep() {
         });
         box.appendChild(form);
       }
+    }
   } else {
     // Letzter Schritt: Darstellung (Theme + OLED + Akzent)
     box.appendChild(el("h3", "wizard-title", t("appearance")));
@@ -2328,6 +2338,10 @@ async function loadAppData() {
   app.cfg = await api("/api/config");
   app.settings = await api("/api/settings");
   applySettings(app.settings);
+  for (const tab of $$(".tab")) {
+    const key = "tab_" + tab.dataset.view;
+    if (LANG[lang()][key]) tab.textContent = t(key);
+  }
   $("#today-label").textContent = t("today_header") + fmtDateLong(app.meta.today);
   setUserChip();
   await loadToday();

styles.css

@@ -63,6 +63,10 @@ html[data-accent="violet"] { --accent: #9a6fd0; --accent-hover: #ab80e0; --accen
 html[data-accent="pink"]   { --accent: #e0567f; --accent-hover: #eb6890; --accent-active: #c74b6e; --accent-ink: #141414; }
 html[data-accent="white"]  { --accent: #ffffff; --accent-hover: #f2f2f2; --accent-active: #e6e6e6; --accent-ink: #141414; --accent-border: #9a9a9a; }
 
+html[data-theme="light"][data-accent="white"] .wp-step { border-color: #8a8a8a; }
+html[data-theme="light"][data-accent="white"] .wp-step.is-done { border-color: #000; background: #000; }
+html[data-theme="light"][data-accent="white"] .wp-step.is-current { border-color: #000; background: transparent; }
+
 html[data-theme="dark"], html[data-theme="oled"] { color-scheme: dark; }
 html[data-theme="light"] { color-scheme: light; }
 
@@ -138,6 +142,18 @@ html, body {
   gap: 0;
   margin-left: auto;
   border: 2px solid var(--border);
+  overflow-x: auto;
+  max-width: 100%;
+}
+
+.tab {
+  white-space: nowrap;
+  flex-shrink: 0;
+}
+
+@media (max-width: 700px) {
+  .topbar { padding: 10px 12px; }
+  .tab { padding: 6px 12px; }
 }
 
 .tab {
@@ -199,6 +215,7 @@ h3 { font-size: 15px; font-weight: 700; }
   font: inherit;
   font-weight: 600;
   padding: 7px 14px;
+  min-width: 96px;
   cursor: pointer;
 }
 
@@ -224,7 +241,7 @@ h3 { font-size: 15px; font-weight: 700; }
 .btn-danger-ghost:hover { background: var(--bg-hover); }
 .btn-danger-ghost.is-armed { background: var(--danger); color: #fff; }
 
-.btn-small { padding: 4px 10px; font-size: 13px; }
+.btn-small { padding: 4px 10px; font-size: 13px; min-width: 64px; }
 .btn-block { width: 100%; }
 
 .icon-btn {
@@ -386,7 +403,7 @@ h3 { font-size: 15px; font-weight: 700; }
 
 .ex-grid {
   display: grid;
-  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
+  grid-template-columns: repeat(auto-fill, minmax(460px, 1fr));
   gap: 14px;
   align-items: start;
 }
@@ -419,12 +436,14 @@ h3 { font-size: 15px; font-weight: 700; }
 
 .set-row {
   display: flex;
-  flex-wrap: wrap;
+  flex-wrap: nowrap;
   gap: 8px;
   align-items: center;
   padding: 6px 10px;
 }
 
+.set-rows { overflow-x: auto; }
+
 .set-row.is-done { background: var(--bg-subtle); }
 
 /* Set-Abhaken: ganzer Button klickbar, mit Ankreuz-Box */
@@ -491,6 +510,8 @@ h3 { font-size: 15px; font-weight: 700; }
 
 .field-input {
   width: 74px;
+  min-width: 60px;
+  height: 32px;
   padding: 6px 4px 6px 8px;
   border: 0;
   background: transparent;
@@ -919,9 +940,13 @@ body.boot #setup-gate { visibility: hidden; }
   width: 640px;
   max-width: calc(100vw - 32px);
   padding: 40px;
+  display: flex;
+  flex-direction: column;
   text-align: left;
 }
 
+#setup-gate .auth-box { min-height: 560px; }
+
 .auth-head {
   display: flex;
   align-items: center;
@@ -1038,7 +1063,8 @@ body.boot #setup-gate { visibility: hidden; }
   display: flex;
   gap: 12px;
   justify-content: space-between;
-  margin-top: 20px;
+  margin-top: auto;
+  padding-top: 20px;
 }
 
 .wizard-nav-right {