Add bigcursor module stub, rename combatlog to logsessions, bump session timer to 60min

- New bigcursor module skeleton with build integration and mutex
- Rename combatlog module to logsessions (directory, files, build options,
  imports, console prefixes, mutex name, DLL variant, docs)
- Increase log session continuation threshold from 30 to 60 minutes
- Update DLL_README log sessions section

src/bigcursor/bigcursor.zig

@@ -0,0 +1,51 @@
+//! Big cursor module.
+//!
+//! Increases the hardware cursor render size for improved visibility.
+//!
+//! TODO: Research cursor rendering pipeline and hook implementation.
+
+const std = @import("std");
+const con = @import("../console.zig");
+
+const WINAPI = std.builtin.CallingConvention.winapi;
+extern "kernel32" fn CreateMutexA(lpMutexAttributes: ?*anyopaque, bInitialOwner: i32, lpName: [*:0]const u8) callconv(WINAPI) ?*anyopaque;
+extern "kernel32" fn ReleaseMutex(hMutex: *anyopaque) callconv(WINAPI) i32;
+extern "kernel32" fn CloseHandle(hObject: *anyopaque) callconv(WINAPI) i32;
+extern "kernel32" fn GetLastError() callconv(WINAPI) u32;
+extern "kernel32" fn GetCurrentProcessId() callconv(WINAPI) u32;
+const ERROR_ALREADY_EXISTS: u32 = 183;
+
+var g_mutex: ?*anyopaque = null;
+var g_is_hook_owner: bool = false;
+
+pub fn installHooks() void {
+    con.print("[bigcursor] Module loaded (stub)\n");
+
+    // Multi-DLL safety: only one instance per process should hook
+    var mutex_name_buf: [64]u8 = undefined;
+    const mutex_name = std.fmt.bufPrint(&mutex_name_buf, "Local\\WeirdUtils_BigcursorHook_{d}", .{GetCurrentProcessId()}) catch return;
+    mutex_name_buf[mutex_name.len] = 0;
+
+    g_mutex = CreateMutexA(null, 1, @ptrCast(mutex_name_buf[0..mutex_name.len :0]));
+    if (g_mutex == null) return;
+
+    if (GetLastError() == ERROR_ALREADY_EXISTS) {
+        _ = CloseHandle(g_mutex.?);
+        g_mutex = null;
+        g_is_hook_owner = false;
+        con.print("[bigcursor] Another DLL owns hooks (mutex taken), skipping\n");
+        return;
+    }
+    g_is_hook_owner = true;
+}
+
+pub fn removeHooks() void {
+    if (g_is_hook_owner) {
+        if (g_mutex) |m| {
+            _ = ReleaseMutex(m);
+            _ = CloseHandle(m);
+            g_mutex = null;
+        }
+    }
+    g_is_hook_owner = false;
+}