⚙️ Prepare v3 release: module path, version window, 3.0.0

Bump the Hugo module path to /v3, adopt a rolling latest-4 Hugo
version window (bot keeps it sliding), document new opt-in params,
and set package version to 3.0.0.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

config/_default/params.toml

@@ -26,6 +26,7 @@ disableTextInHeader = false
 # backgroundImageWidth = 1200
 
 # defaultBackgroundImage = "IMAGE.jpg" # used as default for background images
+# backgroundCanvas = false # render defaultBackgroundImage as a fixed backdrop on every page
 # defaultFeaturedImage = "IMAGE.jpg" # used as default for featured images in all articles
 # defaultSocialImage = "/android-chrome-512x512.png" # used as default for social media sharing (Open Graph and Twitter)
 hotlinkFeatureImage = false
@@ -53,7 +54,8 @@ forgejoDefaultServer = "https://v11.next.forgejo.org"
 # metaDescriptionOrder = ["summary", "description", "site"] # Controls the fallback order for the HTML meta description. Valid values are "summary", "description", and "site".
 
 [header]
-  layout = "basic" # valid options: basic, fixed, fixed-fill, fixed-gradient, fixed-fill-blur
+  layout = "basic" # valid options: basic, fixed, fixed-fill, fixed-gradient, fixed-fill-blur, floating
+  # mobileMenuStyle = "fullscreen" # valid options: fullscreen, dropdown
 
 [footer]
   showMenu = true
@@ -63,7 +65,8 @@ forgejoDefaultServer = "https://v11.next.forgejo.org"
   showScrollToTop = true
 
 [homepage]
-  layout = "profile" # valid options: page, profile, hero, card, background, custom
+  layout = "profile" # valid options: page, profile, hero, card, background, landing, custom
+  # layoutSwitcher = false # opt-in interactive preview of the built-in layouts
   #homepageImage = "IMAGE.jpg" # used in: hero, and card
   showRecent = false
   showRecentItems = 5
@@ -112,6 +115,7 @@ forgejoDefaultServer = "https://v11.next.forgejo.org"
 
 [list]
   showHero = false
+  # featureImageHover = false # subtle zoom on card thumbnails on hover
   # heroStyle = "background" # valid options: basic, big, background, thumbAndBackground
   layoutBackgroundBlur = true # only used when heroStyle equals background or thumbAndBackground
   layoutBackgroundHeaderSpace = true # only used when heroStyle equals background