Refactor alias handling: simplify detection logic and reduce allocations

[Copilot]

Restructures alias handling in parse_hotkey to address code review feedback on #21 requesting better high-level structure.

Changes

• Forward-compatible standalone detection: Replace exhaustive token enumeration (Token_Command | Token_Forward | Token_BeginList | ...) with next_token == Token_Dash || next_token == Token_Plus. Alias is standalone unless followed by - or +.

• Single visited list: Create once per hotkey, reuse with clearRetainingCapacity() instead of creating/destroying 3+ times per parse.

• Clearer semantics: Rename is_standalone_keysym → key_parsed to reflect what it actually tracks (key already determined, not alias type).

Before/After

// Before: brittle, checks all possible action tokens
if (next_is_command or next_is_forward or next_is_begin_list or 
    next_is_unbound or next_is_arrow or next_is_activate or self.peek() == null) {
    var visited = std.ArrayList([]const u8).init(self.allocator);  // allocation #1
    defer visited.deinit();
    // ...
}

// After: forward-compatible, single allocation
var visited = std.ArrayList([]const u8).init(self.allocator);  // once
defer visited.deinit();

const is_modifier_use = if (next_token) |tok| 
    tok.type == .Token_Dash or tok.type == .Token_Plus 
else false;

Net: -5 lines, clearer logic, fewer allocations.

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