Fix: Memory leak in CurrentUser.getCurrentUser()

Fixed memory leak where an UnsafeMutablePointer<passwd> was allocated
but never deallocated.

Issue Analysis:
- Line 43 was allocating heap memory for `result` pointer
- getpwuid_r() immediately overwrites `result` to point to `pwd` (stack)
- The allocated heap memory was leaked on every call
- Attempting to deallocate crashed because `result` pointed to stack memory

Root Cause:
The allocation was unnecessary. getpwuid_r() expects `result` as an
output parameter - it sets the pointer itself, no pre-allocation needed.

Solution:
Removed the unnecessary .allocate(capacity: 1) call. Now `result` is
initialized as nil and getpwuid_r() sets it to point to `pwd` on success.

This function is called every time a terminal is opened, so the leak
would accumulate with each terminal session.

Author: vksvicky

CodeEdit/Features/TerminalEmulator/Model/CurrentUser.swift

@@ -39,8 +39,8 @@ struct CurrentUser {
             buffer.deallocate()
         }
         var pwd = passwd()
-        // points to `pwd`
-        var result: UnsafeMutablePointer<passwd>? = UnsafeMutablePointer<passwd>.allocate(capacity: 1)
+        // `result` will be set by getpwuid_r to point to `pwd` on success
+        var result: UnsafeMutablePointer<passwd>?
 
         if getpwuid_r(getuid(), &pwd, buffer, bufsize, &result) != 0 { return nil }