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/vscode-extension/README.md

@@ -14,7 +14,7 @@ Full syntax highlighting for all JQHTML constructs:
 - **Slots**: `<#slotname>` with let:prop support
 - **Data Bindings**: `:property="value"`
 - **Event Handlers**: `@click="handler"`
-- **Special Attributes**: `$id="name"`, `$property="value"`
+- **Special Attributes**: `$sid="name"`, `$property="value"`
 - **Components**: `<MyComponent />`
 - **Comments**: `<%-- comment --%>`
 
@@ -38,7 +38,7 @@ Quick snippets for common patterns:
 | `ifelse` | If-else |
 | `for` | For loop |
 | `exp` | Expression `<%= %>` |
-| `$id` | Scoped ID attribute |
+| `$sid` | Scoped ID attribute |
 | `:prop` | Property binding |
 | `@event` | Event handler |
 | `slot` | Named slot |
@@ -81,7 +81,7 @@ All JQHTML syntax is highlighted with semantic colors:
 
 ```jqhtml
 <Define:UserCard>
-  <div class="user-card" $id="card">
+  <div class="user-card" $sid="card">
     <h2><%= this.data.name %></h2>
 
     <% if (this.data.isAdmin) { %>