fix: add PHP grammar support to smart-file-read parser (fixes #1617)

PHP was listed as a supported language in CHANGELOG and .php files were
scanned by search.ts, but parser.ts was missing:
- .php extension in LANG_MAP (causing detectLanguage to return 'unknown')
- 'php' entry in GRAMMAR_PACKAGES (no grammar path to resolve)
- PHP query patterns for symbol extraction
- PHP case in getQueryKey()

This meant smart_search/smart_outline/smart_unfold scanned PHP files
but extracted 0 symbols because the grammar could not be resolved.

Changes:
- Add '.php' -> 'php' to LANG_MAP
- Add 'php' -> 'tree-sitter-php/php' to GRAMMAR_PACKAGES
- Add PHP tree-sitter query patterns (functions, methods, classes, interfaces, traits, use statements)
- Add 'php' case to getQueryKey()
- Add tree-sitter-php ^0.24.2 to devDependencies

package.json

@@ -138,6 +138,7 @@
     "tree-sitter-go": "^0.25.0",
     "tree-sitter-java": "^0.23.5",
     "tree-sitter-javascript": "^0.25.0",
+    "tree-sitter-php": "^0.24.2",
     "tree-sitter-python": "^0.25.0",
     "tree-sitter-ruby": "^0.23.1",
     "tree-sitter-rust": "^0.24.0",

src/services/smart-file-read/parser.ts

@@ -3,7 +3,7 @@
  *
  * No native bindings. No WASM. Just the CLI binary + query patterns.
  *
- * Supported: JS, TS, Python, Go, Rust, Ruby, Java, C, C++
+ * Supported: JS, TS, Python, Go, Rust, Ruby, Java, C, C++, PHP
  *
  * by Copter Labs
  */
@@ -66,6 +66,7 @@ const LANG_MAP: Record<string, string> = {
   ".cxx": "cpp",
   ".hpp": "cpp",
   ".hh": "cpp",
+  ".php": "php",
 };
 
 export function detectLanguage(filePath: string): string {
@@ -86,6 +87,7 @@ const GRAMMAR_PACKAGES: Record<string, string> = {
   java: "tree-sitter-java",
   c: "tree-sitter-c",
   cpp: "tree-sitter-cpp",
+  php: "tree-sitter-php/php",
 };
 
 function resolveGrammarPath(language: string): string | null {
@@ -159,6 +161,15 @@ const QUERIES: Record<string, string> = {
 (class_definition name: (identifier) @name) @cls
 (import_statement) @imp
 (import_declaration) @imp
+`,
+
+  php: `
+(function_definition name: (name) @name) @func
+(method_declaration name: (name) @name) @method
+(class_declaration name: (name) @name) @cls
+(interface_declaration name: (name) @name) @iface
+(trait_declaration name: (name) @name) @trait_def
+(namespace_use_declaration) @imp
 `,
 };
 
@@ -173,6 +184,7 @@ function getQueryKey(language: string): string {
     case "rust": return "rust";
     case "ruby": return "ruby";
     case "java": return "java";
+    case "php": return "php";
     default: return "generic";
   }
 }