feat: Auto-track all links and views without manual configuration

[ilhamsj]

Is your feature request related to a problem? Please describe.

Yes. Currently, users must manually track links and views in campaigns:

1. Link tracking: Users must either:

   • Add @TrackLink suffix to URLs (e.g., https://example.com@TrackLink)
   • Use {{ TrackLink "url" }} template syntax
   • Check the "Track link?" checkbox in the rich text editor for each link

2. View tracking: Users must manually insert {{ TrackView }} in email templates.

This is error-prone:

• Users forget to track links, leading to incomplete analytics
• Users forget to add {{ TrackView }}, missing open tracking
• Manual work slows campaign creation
• New users may not know about these features

Describe the solution you'd like

Automatically track all links and views without manual steps:

1. Automatic link tracking:

   • Automatically wrap all URLs in campaign content with {{ TrackLink }} during template compilation
   • Exclude system URLs (UnsubscribeURL, MessageURL, ManageURL, OptinURL) to avoid double-tracking
   • Preserve existing manual @TrackLink or {{ TrackLink }} usage for backward compatibility

2. Automatic view tracking:

   • Automatically insert {{ TrackView }} before the closing </body> tag (or at the end if no body tag exists)
   • Skip insertion if {{ TrackView }} already exists in the template

Technical implementation approach

1. Auto TrackLink (in models/campaigns.go - CompileTemplate()):

   • Parse HTML in campaign body using Go's html package
   • Find all <a href="..."> tags
   • Replace URLs with {{ TrackLink "url" . }} except for system URLs
   • Process after markdown conversion (if applicable) but before template compilation

2. Auto TrackView (in models/campaigns.go - CompileTemplate()):

   • Check if {{ TrackView }} exists in template body
   • If not, append it before </body> or at the end of the template
   • Process during template compilation phase

Why this makes sense for the project

• Improves UX: removes manual steps and reduces errors
• Better analytics: ensures consistent tracking
• Backward compatible: existing manual tracking continues to work
• Aligns with common email marketing tools that auto-track by default
• Low risk: changes are in template compilation, not core functionality

Additional context

• The rich text editor already defaults the "Track link?" checkbox to true (line 277 in RichtextEditor.vue), indicating intent for tracking by default
• Current tracking infrastructure supports this; we just need to automate the application