fix(extraction): strip template args from out-of-line C++ method qualifiers (#1286)

[Dshuishui]

Fixes #1286.

Problem

stripCppTemplateArgs (added in #1043 to drop <…> from templated base-class refs so extends resolves) isn't applied to method qualifiers. An out-of-line template method keeps the class template params in qualified_name:

template <typename T> class Box { public: T get() const; };
template <typename T> T Box<T>::get() const { /* ... */ }
// → qualified_name = "Box<T>::get"   (expected "Box::get")

• name is already clean (get); only the qualifier leaks.
• Inline method bodies are unaffected (Box::get) — the same method got a different qualified_name depending on where it's defined.
• Long/multi-line template params (ICU capi_helper.h shape) push the qualified_name past NAME_MAX (255) → consumers deriving a filename hit "File name too long".
• Same failure mode Support for C++ classes inheriting templated classes in C++ #1043 fixed for extends: name-matcher compares the qualifier before the last ::, and Box<T> ≠ the class node Box.

Fix

Apply the existing stripCppTemplateArgs to the receiver in extractCppReceiverType, before the :: split (also tolerates :: inside template args like Box<std::string>::get). Reuses the #1043 helper.

Tests

• __tests__/extraction.test.ts: out-of-line Box<T>::get/set now extract as Box::get/Box::set; no node carries < in its qualified name.
• All template-related tests (incl. Support for C++ classes inheriting templated classes in C++ #1043) pass.

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