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/dist/codegen.js

@@ -1042,14 +1042,14 @@ export class CodeGenerator {
         const entries = Object.entries(attrs).flatMap(([key, value]) => {
             // Convert 'tag' to '_tag' for component invocations
             const attrKey = key === 'tag' ? '_tag' : key;
-            // Special handling for data-id attribute (from $id) - create scoped id
-            // NOTE: Parser converts $id="foo" → data-id="foo" so we can distinguish from regular id
-            // This generates: id="foo:PARENT_CID" data-id="foo"
+            // Special handling for data-sid attribute (from $sid) - create scoped id
+            // NOTE: Parser converts $sid="foo" → data-sid="foo" so we can distinguish from regular id
+            // This generates: id="foo:PARENT_CID" data-sid="foo"
             // The :PARENT_CID scoping happens at runtime in instruction-processor.ts
-            if (key === 'data-id') {
+            if (key === 'data-sid') {
                 const id_entries = [];
                 if (value && typeof value === 'object' && value.interpolated) {
-                    // Interpolated $id like $id="user<%= index %>"
+                    // Interpolated $sid like $sid="user<%= index %>"
                     const parts = value.parts.map((part) => {
                         if (part.type === 'text') {
                             return this.escape_string(part.value);
@@ -1060,19 +1060,19 @@ export class CodeGenerator {
                     });
                     const base_id = parts.join(' + ');
                     id_entries.push(`"id": ${base_id} + ":" + this._cid`);
-                    id_entries.push(`"data-id": ${base_id}`);
+                    id_entries.push(`"data-sid": ${base_id}`);
                 }
                 else if (value && typeof value === 'object' && value.quoted) {
-                    // Quoted $id like $id="static"
+                    // Quoted $sid like $sid="static"
                     const base_id = this.escape_string(value.value);
                     id_entries.push(`"id": ${base_id} + ":" + this._cid`);
-                    id_entries.push(`"data-id": ${base_id}`);
+                    id_entries.push(`"data-sid": ${base_id}`);
                 }
                 else {
-                    // Simple $id like $id="username" or expression like $id=someVar
+                    // Simple $sid like $sid="username" or expression like $sid=someVar
                     const base_id = this.escape_string(String(value));
                     id_entries.push(`"id": ${base_id} + ":" + this._cid`);
-                    id_entries.push(`"data-id": ${base_id}`);
+                    id_entries.push(`"data-sid": ${base_id}`);
                 }
                 return id_entries;
             }
@@ -1348,7 +1348,7 @@ export class CodeGenerator {
         for (const [name, component] of this.components) {
             code += `// Component: ${name}\n`;
             code += `jqhtml_components.set('${name}', {\n`;
-            code += `  _jqhtml_version: '2.2.217',\n`; // Version will be replaced during build
+            code += `  _jqhtml_version: '2.2.218',\n`; // Version will be replaced during build
             code += `  name: '${name}',\n`;
             code += `  tag: '${component.tagName}',\n`;
             code += `  defaultAttributes: ${this.serializeAttributeObject(component.defaultAttributes)},\n`;

node_modules/@jqhtml/parser/dist/parser.js

@@ -109,9 +109,9 @@ export class Parser {
         }
         while (!this.check(TokenType.GT) && !this.is_at_end()) {
             const attr_name = this.consume(TokenType.ATTR_NAME, 'Expected attribute name');
-            // Validate that $id is not used in Define tags
-            if (attr_name.value === '$id') {
-                throw syntaxError('$id is not allowed in <Define:> tags. Component definitions cannot have scoped IDs.', attr_name.line, attr_name.column, this.source, this.filename);
+            // Validate that $sid is not used in Define tags
+            if (attr_name.value === '$sid') {
+                throw syntaxError('$sid is not allowed in <Define:> tags. Component definitions cannot have scoped IDs.', attr_name.line, attr_name.column, this.source, this.filename);
             }
             this.consume(TokenType.EQUALS, 'Expected =');
             const attr_value = this.parse_attribute_value();
@@ -535,10 +535,10 @@ export class Parser {
             }
             // Handle special attribute prefixes
             if (name.startsWith('$')) {
-                // Special case: $id becomes data-id (needed for scoped ID system)
+                // Special case: $sid becomes data-sid (needed for scoped ID system)
                 // All other $ attributes stay as-is (handled by instruction-processor.ts)
-                if (name === '$id') {
-                    name = 'data-id';
+                if (name === '$sid') {
+                    name = 'data-sid';
                 }
                 // Keep $ prefix for other attributes - they get stored via .data() at runtime
                 // Keep the value object intact to preserve quoted/unquoted distinction
@@ -781,7 +781,7 @@ export class Parser {
                 '  Or set attributes in on_ready() using jQuery:\n' +
                 '    ✅ <tag $id="my_element">\n' +
                 '       on_ready() {\n' +
-                '         if (this.args.required) this.$id(\'my_element\').attr(\'required\', true);\n' +
+                '         if (this.args.required) this.$sid(\'my_element\').attr(\'required\', true);\n' +
                 '       }';
             throw error;
         }