Fix code quality violations for publish

Remove unused blade settings pages not linked from UI
Convert remaining frontend pages to SPA actions
Convert settings user_settings and general to SPA actions
Convert settings profile pages to SPA actions
Convert contacts and projects add/edit pages to SPA actions
Convert clients add/edit page to SPA action with loading pattern
Refactor component scoped IDs from $id to $sid
Fix jqhtml comment syntax and implement universal error component system
Update all application code to use new unified error system
Remove all backwards compatibility - unified error system complete
Phase 5: Remove old response classes
Phase 3-4: Ajax response handler sends new format, old helpers deprecated
Phase 2: Add client-side unified error foundation
Phase 1: Add server-side unified error foundation
Add unified Ajax error response system with constants

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

node_modules/@jqhtml/parser/README.md

@@ -390,7 +390,7 @@ These patterns inform v2 implementation decisions, particularly around maintaini
 - **Expressions**: `<%= expression %>` for output
 - **Bindings**: `:text`, `:value`, `:class`, `:style` for data binding
 - **Events**: `@click`, `@change`, etc. for event handlers
-- **Scoped IDs**: `$id` attribute for component-scoped IDs
+- **Scoped IDs**: `$sid` attribute for component-scoped IDs
 
 ### Instruction Format