docs(user): update appearance/profile instructions for sidebar UI

- Theme switching lives in the sidebar's Appearance panel (palette
  icon): swatch list with a checkmark on the active theme, and the
  'Bookshelf' section below it for wood textures; on small screens the
  sidebar opens via the top-bar menu button
- Profile: account menu is the username accordion at the bottom of the
  sidebar (not top-right); save button is 'Save Changes'
- Remove Wood Light/Dark/Mahogany from the Available Themes list (they
  are bookshelf backgrounds, not color themes) and consolidate the
  Catppuccin variants

docs/user/profile-guide.md

@@ -6,10 +6,10 @@ Your profile contains your account information and preferences.
 
 ### How to Update
 
-1. Click on your **username** (top-right)
-2. Select **Profile** from the dropdown
+1. Click on your **username** at the bottom of the sidebar to expand the account menu
+2. Select **Profile**
 3. Edit any fields in the "Account Information" section
-4. Click **Update Profile**
+4. Click **Save Changes**
 5. Changes take effect immediately
 
 ### Fields You Can Update
@@ -65,7 +65,7 @@ When you delete your account:
 1. Go to **Profile** page
 2. Scroll to "Danger Zone" (bottom of page)
 3. Click **Remove My Account**
-4. Confirm by clicking "OK" in the popup
+4. Confirm the deletion prompt
 
 **Note:** If you're the last admin, you cannot delete your account for security reasons.
 
@@ -75,10 +75,12 @@ Personalize your reading experience with different color themes.
 
 ### Quick Theme Switch
 
-1. Click the **paintbrush icon** (top-right, next to your username)
-2. Select a theme from the dropdown
+1. In the sidebar, open the **Appearance** panel (palette icon, near the bottom)
+2. Select a theme from the list; your active theme is marked with a checkmark
 3. Changes apply instantly
 
+For the full theme list and bookshelf background (wood) options, see [Themes and Wood Paneling](themes.md).
+
 ### Available Themes
 
 - **Tokyo Night** (default) - Blue/purple accents
@@ -88,9 +90,7 @@ Personalize your reading experience with different color themes.
 - **Monokai** - Classic vibrant colors
 - **One Dark Pro** - Atom editor inspired
 - **Material Dark** - Google Material Design
-- **Wood Light** - Light wood texture
-- **Wood Dark** - Dark wood texture
-- **Wood Mahogany** - Reddish-brown wood
+- **Catppuccin Mocha / Macchiato / Frappé / Latte** - Soothing pastel palettes (Latte is light)
 
 ## For Admin Users