fix(content): replace 7 broken Unsplash image URLs with working alternatives

- perfect-banana-bread: replace cover and body image (2 URLs)
- easy-homemade-sourdough-bread: replace cover, starter, and fermentation images (3 URLs)
- air-fryer-recipes-beginners: replace body image (1 URL)
- 15-minute-chicken-breast-recipes: replace body image (1 URL)

All replacement URLs verified as 200 OK.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

Author: blogcompany0

content/post/15-minute-chicken-breast-recipes/index.md

@@ -129,7 +129,7 @@ Serve over jasmine rice with a fried egg on top. That runny yolk mixing into the
 
 **Season before, not after.** Salt needs time to penetrate the meat. Even five minutes of seasoning before cooking makes a noticeable difference compared to salting at the table.
 
-![Instant-read meat thermometer inserted into a chicken breast showing safe temperature](https://images.unsplash.com/photo-1625937286930-3c5bc0068db0?w=900&auto=format&fit=crop&q=80)
+![Instant-read meat thermometer inserted into a chicken breast showing safe temperature](https://images.unsplash.com/photo-1598103442097-8b74394b95c6?w=900&auto=format&fit=crop&q=80)
 *An instant-read thermometer takes the guesswork out of chicken. Image credit: [Unsplash](https://unsplash.com)*
 
 ## Making It Work for Your Week

content/post/air-fryer-recipes-beginners/index.md

@@ -40,7 +40,7 @@ Whether you're a complete air fryer beginner or just looking for new air fryer r
 
 **Shake the basket halfway through.** For anything small — fries, vegetables, chicken pieces — give the basket a shake or flip the food at the halfway mark. This ensures even browning on all sides.
 
-![Air fryer basket with food arranged in a single layer for even cooking](https://images.unsplash.com/photo-1585325701165-351af679e400?w=900&auto=format&fit=crop&q=80)
+![Air fryer basket with food arranged in a single layer for even cooking](https://images.unsplash.com/photo-1562967914-608f82629710?w=900&auto=format&fit=crop&q=80)
 *Single layer, space between pieces. That's the golden rule of air frying. Image credit: [Unsplash](https://unsplash.com)*
 
 ## The Recipes

content/post/easy-homemade-sourdough-bread/index.md

@@ -7,7 +7,7 @@ categories: ["Baking", "Bread"]
 tags: ["sourdough bread recipe", "homemade bread", "sourdough starter", "beginner baking", "artisan bread"]
 description: "Think sourdough is too hard for beginners? This step-by-step guide walks you through making your first loaf — from building a starter to pulling a crusty, tangy bread out of the oven."
 featuredImage:
-  url: "https://images.unsplash.com/photo-1585478259715-876acc5be8eb?w=900&auto=format&fit=crop&q=80"
+  url: "https://images.unsplash.com/photo-1549931319-a545dcf3bc73?w=900&auto=format&fit=crop&q=80"
   alt: "Freshly baked sourdough bread loaf with golden crust on a cooling rack"
   credit: "Unsplash"
 references:
@@ -43,7 +43,7 @@ Day 2-6: Every 24 hours, discard half the mixture and feed it with 50g all-purpo
 
 By day 5 or 6, you should see consistent bubbling and a pleasant sour smell. The mixture should roughly double in size within 4-8 hours of feeding. That's when you know it's ready.
 
-![Bubbly active sourdough starter in a glass jar showing fermentation](https://images.unsplash.com/photo-1603379016822-e6d5e2770ece?w=900&auto=format&fit=crop&q=80)
+![Bubbly active sourdough starter in a glass jar showing fermentation](https://images.unsplash.com/photo-1590779033100-9f60a05a013d?w=900&auto=format&fit=crop&q=80)
 *A healthy, active starter full of bubbles. The rubber band marks where it was after feeding — you can see how much it's risen. Image credit: [Unsplash](https://unsplash.com)*
 
 A few things that tripped me up early on:
@@ -82,7 +82,7 @@ These folds build strength in the dough without kneading. After 3-4 sets, you'll
 
 After the folds, leave the dough alone. Depending on your kitchen temperature, bulk fermentation takes 4-8 hours total. You're looking for the dough to increase in volume by about 50-75% — not quite doubled. It should feel airy and jiggly when you shake the bowl, with visible bubbles on the surface and sides.
 
-![Sourdough dough in a bowl showing bubbles and rise during bulk fermentation](https://images.unsplash.com/photo-1590137876181-2a5a7e340de2?w=900&auto=format&fit=crop&q=80)
+![Sourdough dough in a bowl showing bubbles and rise during bulk fermentation](https://images.unsplash.com/photo-1574226516831-e1dff420e562?w=900&auto=format&fit=crop&q=80)
 *Dough after bulk fermentation — notice the bubbles and domed surface. It should jiggle like a water balloon when you nudge the bowl. Image credit: [Unsplash](https://unsplash.com)*
 
 ### Step 3: Shape and Cold Proof (Overnight)

content/post/perfect-banana-bread/index.md

@@ -7,7 +7,7 @@ categories: ["Baking", "Breakfast"]
 tags: ["banana bread", "baking recipes", "easy baking", "banana recipes", "comfort food", "best banana bread", "banana bread recipe"]
 description: "Banana bread seems simple, but getting it perfect — moist, tender, with deep banana flavor — takes a few tricks. Here's the recipe I've spent years perfecting, plus the science behind why it works."
 featuredImage:
-  url: "https://images.unsplash.com/photo-1605090930601-29fa89351eb1?w=900&auto=format&fit=crop&q=80"
+  url: "https://images.unsplash.com/photo-1590080875515-8a3a8dc5735e?w=900&auto=format&fit=crop&q=80"
   alt: "Sliced banana bread loaf with golden crust on a wooden cutting board"
   credit: "Unsplash"
 references:
@@ -133,5 +133,5 @@ Good banana bread shouldn't be complicated. It's a mixing bowl, a loaf pan, and
 
 If you're getting into baking, our [sourdough bread guide](/p/easy-homemade-sourdough-bread/) is a great next challenge. And for a protein-packed way to enjoy banana bread for breakfast, pair a slice with one of our [high-protein breakfast ideas](/p/high-protein-breakfast-ideas/). This banana bread recipe also pairs beautifully with a [homemade pizza dough](/p/homemade-pizza-dough/) weekend — bake the bread Saturday, make pizza Sunday. And if you're cooking on a budget, our [budget-friendly family dinners](/p/budget-friendly-family-dinners/) prove that great food doesn't have to be expensive.
 
-![Slice of moist banana bread with visible banana pieces and golden crumb texture](https://images.unsplash.com/photo-1584776252987-46add8cdbe8e?w=900&auto=format&fit=crop&q=80)
+![Slice of moist banana bread with visible banana pieces and golden crumb texture](https://images.unsplash.com/photo-1558401391-7899b4bd5bbf?w=900&auto=format&fit=crop&q=80)
 *Moist, tender, deeply banana-flavored. That's the goal. Image credit: [Unsplash](https://unsplash.com)*