fix: escape regex special chars in pattern matcher

Fixes #1521. When hook matcher patterns contained regex special characters
like parentheses, the pattern-matcher would throw 'SyntaxError: Invalid
regular expression: unmatched parentheses' because these characters were
not escaped before constructing the RegExp.

The fix escapes all regex special characters (.+?^${}()|[\]\) EXCEPT
the asterisk (*) which is intentionally converted to .* for glob-style
matching.

Add comprehensive test suite for pattern-matcher covering:
- Exact matching (case-insensitive)
- Wildcard matching (glob-style *)
- Pipe-separated patterns
- All regex special characters (parentheses, brackets, etc.)
- Edge cases (empty matcher, complex patterns)

src/shared/pattern-matcher.ts

@@ -1,5 +1,14 @@
 import type { ClaudeHooksConfig, HookMatcher } from "../hooks/claude-code-hooks/types"
 
+/**
+ * Escape all regex special characters EXCEPT asterisk (*).
+ * Asterisk is preserved for glob-to-regex conversion.
+ */
+function escapeRegexExceptAsterisk(str: string): string {
+  // Escape all regex special chars except * (which we convert to .* for glob matching)
+  return str.replace(/[.+?^${}()|[\]\\]/g, "\\$&")
+}
+
 export function matchesToolMatcher(toolName: string, matcher: string): boolean {
   if (!matcher) {
     return true
@@ -7,7 +16,9 @@ export function matchesToolMatcher(toolName: string, matcher: string): boolean {
   const patterns = matcher.split("|").map((p) => p.trim())
   return patterns.some((p) => {
     if (p.includes("*")) {
-      const regex = new RegExp(`^${p.replace(/\*/g, ".*")}$`, "i")
+      // First escape regex special chars (except *), then convert * to .*
+      const escaped = escapeRegexExceptAsterisk(p)
+      const regex = new RegExp(`^${escaped.replace(/\*/g, ".*")}$`, "i")
       return regex.test(toolName)
     }
     return p.toLowerCase() === toolName.toLowerCase()