fix: 4 Bugs behoben — Dark-Mode Inputs, Essensplan, Dashboard-Refresh, Mengenfeld

1. Dark Mode: .form-input hatte kein Styling, Browser-Default führte zu
   weißem Text auf weißem Hintergrund. Jetzt mit .input zusammengefasst.
2. Essensplan: DATE_RE fehlte im Import (ReferenceError), db.transaction()
   wurde doppelt aufgerufen (3 Stellen).
3. Dashboard: Router-Guard verhinderte Re-Render bei Rücknavigation,
   Widgets zeigten veraltete Daten.
4. Einkaufsliste: Mengenfeld hatte abweichende Hintergrundfarbe und
   überdimensionierte min-height.

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

public/router.js

@@ -60,7 +60,6 @@ async function navigate(path, userOrPushState = true, pushState = true) {
     pushState = userOrPushState;
   }
 
-  if (path === currentPath) return;
   currentPath = path;
 
   const route = ROUTES.find((r) => r.path === path) ?? ROUTES.find((r) => r.path === '/');

public/styles/layout.css

@@ -805,7 +805,8 @@
 /* --------------------------------------------------------
  * Form-Elemente
  * -------------------------------------------------------- */
-.input {
+.input,
+.form-input {
   width: 100%;
   padding: var(--space-2) var(--space-3);
   border-radius: var(--radius-sm);
@@ -818,19 +819,22 @@
 }
 
 @media (min-width: 1024px) {
-  .input {
+  .input,
+  .form-input {
     min-height: var(--target-md);
     font-size: var(--text-base);
   }
 }
 
-.input:focus {
+.input:focus,
+.form-input:focus {
   outline: none;
   border-color: var(--color-accent);
   box-shadow: 0 0 0 3px var(--color-accent-light);
 }
 
-.input::placeholder {
+.input::placeholder,
+.form-input::placeholder {
   color: var(--color-text-disabled);
 }
 

public/styles/shopping.css

@@ -178,11 +178,11 @@
   padding: var(--space-1) var(--space-2);
   border-radius: var(--radius-xs);
   border: 1px solid var(--color-border);
-  background-color: var(--color-surface-2);
-  color: var(--color-text-secondary);
+  background-color: var(--color-surface);
+  color: var(--color-text-primary);
   font-size: var(--text-sm);
   text-align: center;
-  min-height: var(--target-lg);
+  min-height: auto;
   height: auto;
 }
 

server/routes/meals.js

@@ -9,7 +9,7 @@
 const express = require('express');
 const router  = express.Router();
 const db      = require('../db');
-const { str, oneOf, date, collectErrors, MAX_TITLE, MAX_TEXT, MAX_SHORT } = require('../middleware/validate');
+const { str, oneOf, date, collectErrors, MAX_TITLE, MAX_TEXT, MAX_SHORT, DATE_RE } = require('../middleware/validate');
 
 const VALID_MEAL_TYPES = ['breakfast', 'lunch', 'dinner', 'snack'];
 
@@ -181,7 +181,7 @@ router.post('/', (req, res) => {
         LEFT JOIN users u ON u.id = m.created_by
         WHERE m.id = ?
       `).get(mealId);
-    })();
+    });
 
     // Zutaten anhängen
     const ings = db.get().prepare(
@@ -403,7 +403,7 @@ router.post('/:id/to-shopping-list', (req, res) => {
         count++;
       }
       return count;
-    })();
+    });
 
     res.json({ data: { transferred } });
   } catch (err) {
@@ -459,7 +459,7 @@ router.post('/week-to-shopping-list', (req, res) => {
         count++;
       }
       return count;
-    })();
+    });
 
     res.json({ data: { transferred } });
   } catch (err) {