fix: prevent renaming aliased functions during rename request

[nikhilcodes777]

Fixes #3184

Description

This fixes an issue where triggering a textDocument/rename on a local alias of a function (e.g., const testName = std.debug.print;) would incorrectly resolve the alias to its source and rename the original declaration (e.g., renaming print inside the Zig standard library).

Root Cause:
During a rename request, referencesHandler and the reference-gathering Builder were aggressively resolving aliases using analyser.resolveVarDeclAlias. While this is desired for textDocument/references or highlight, it results in cross-file destruction during a rename.

Changes:

• Added a resolve_aliases boolean flag to the Builder struct in src/features/references.zig.
• Conditionally bypassed resolveVarDeclAlias in both referencesHandler and Builder.referenceNode if request == .rename.
• This ensures that a rename operation strictly targets the literal identifier the user initiated the rename on, preserving the underlying source declaration.

Environment / Tested On

• zig 0.16.0
• zig 0.17.0-dev.215+8c5542bd3
• emacs/neovim

Test Case Used

const std = @import("std");

const foo = struct {
    pub fn print(comptime fmt: []const u8, args: anytype) void {
        std.debug.print(fmt, args);
    }
};

const fein = foo.print;

pub fn main() void {
    // Renaming `fein` here no longer renames `foo.print`
    fein("Hello world \n", .{});
}