Fix zu schmale Eingabefelder in Inline-Reihen

Eingaben haben global width:100% und schrumpften im Flex-Layout zusammen
(Mindestbestand-Einheit abgeschnitten, Chargen-Bearbeitung winzig).
- .field-inline: Zahlenfelder wachsen (min 78px), Einheiten-Dropdowns behalten
  ihre Textbreite (min 132px).
- In Tabellenzellen brechen die Felder bei wenig Platz um statt zu quetschen.
- Einengende Inline-maxWidth entfernt; Menge-/MHD-Spalte mit Mindestbreite.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/src/pages/ProductForm.jsx

@@ -278,7 +278,7 @@ export default function ProductForm() {
                 <input type="number" step="any" value={form.min_stock}
                   onChange={(e) => set("min_stock", e.target.value)} disabled={readOnly} placeholder="z.B. 2" />
                 <select value={minUnit || form.unit_id} onChange={(e) => changeMinUnit(e.target.value)}
-                  disabled={readOnly} style={{ maxWidth: 190, marginTop: 0 }}>
+                  disabled={readOnly} style={{ marginTop: 0 }}>
                   {units
                     .filter((u) => !selectedUnit || u.kind === selectedUnit.kind)
                     .map((u) => <option key={u.id} value={u.id}>{u.name}</option>)}
@@ -411,7 +411,12 @@ function LotsCard({ product, lots, baseShort, warnDays, isAdmin, imageUrl, onCha
       <div className="table-wrap">
         <table className="table">
           <thead>
-            <tr><th className="num">Menge</th><th>MHD</th><th>Eingelagert</th><th></th></tr>
+            <tr>
+              <th className="num" style={{ minWidth: 150 }}>Menge</th>
+              <th style={{ minWidth: 160 }}>MHD</th>
+              <th>Eingelagert</th>
+              <th></th>
+            </tr>
           </thead>
           <tbody>
             {lots.map((l) => {
@@ -425,10 +430,10 @@ function LotsCard({ product, lots, baseShort, warnDays, isAdmin, imageUrl, onCha
                       <div className="field-inline" style={{ justifyContent: "flex-end" }}>
                         <input type="number" step="any" min="0" value={draft.quantity}
                           onChange={(e) => setDraft({ ...draft, quantity: e.target.value })}
-                          style={{ maxWidth: 90, marginTop: 0 }} />
+                          style={{ marginTop: 0 }} />
                         {pkgSize > 0 ? (
                           <select value={editUnit} onChange={(e) => changeEditUnit(e.target.value)}
-                            style={{ maxWidth: 120, marginTop: 0 }}>
+                            style={{ marginTop: 0 }}>
                             <option value="package">Packung(en)</option>
                             <option value="unit">{unitName}</option>
                           </select>
@@ -449,7 +454,7 @@ function LotsCard({ product, lots, baseShort, warnDays, isAdmin, imageUrl, onCha
                     {editing ? (
                       <input type="date" value={draft.best_before}
                         onChange={(e) => setDraft({ ...draft, best_before: e.target.value })}
-                        style={{ maxWidth: 150, marginTop: 0 }} />
+                        style={{ marginTop: 0, minWidth: 150 }} />
                     ) : (
                       <>
                         {l.best_before || "–"}