modernize the codebase

Run the modernize linter across the codebase.
Change generated by running:

```
go run golang.org/x/tools/gopls/internal/analysis/modernize/cmd/modernize@latest -fix -test ./...
```

Ref:
https://pkg.go.dev/golang.org/x/tools/gopls/internal/analysis/modernize

internal/web/handlers/adminDash.go

@@ -28,7 +28,7 @@ func NewAdminDashboardHandler(
 		postService: postService,
 		jwt:         jwt,
 		cfg:         cfg,
-		 imgKit:      imgKit,
+		imgKit:      imgKit,
 	}
 }
 
@@ -61,8 +61,8 @@ func (adh *AdminDashboardHandler) RejectMedia(c *gin.Context) {
 func (adh *AdminDashboardHandler) GetMedia(c *gin.Context) {
 	media := adh.postService.GetMedia()
 	// TODO: Fix this - we need to inject ImgKitHelper
-	 media.PreviewUrl = adh.imgKit.GetPreviewUrl(media.RemoteUrl)
-	 media.RemoteUrl = adh.imgKit.GetRemoteUrl(media.RemoteUrl)
+	media.PreviewUrl = adh.imgKit.GetPreviewUrl(media.RemoteUrl)
+	media.RemoteUrl = adh.imgKit.GetRemoteUrl(media.RemoteUrl)
 	c.JSON(http.StatusOK, media)
 }
 
@@ -77,7 +77,7 @@ func (adh *AdminDashboardHandler) Login(c *gin.Context) {
 	}
 
 	if input.Password == adh.cfg.AdminPassword { // Its more than enough for this project
-		token, err := adh.jwt.GenerateToken(map[string]interface{}{"role": "admin"})
+		token, err := adh.jwt.GenerateToken(map[string]any{"role": "admin"})
 		if err != nil {
 			c.JSON(http.StatusInternalServerError, gin.H{"error": "Token generation failed"})
 			return
@@ -97,4 +97,4 @@ func (adh *AdminDashboardHandler) Login(c *gin.Context) {
 // Expose the JWT middleware for use in routes
 func (adh *AdminDashboardHandler) JWTMiddleware() gin.HandlerFunc {
 	return adh.jwt.GinMiddleware()
-}
+}