Lets moderators assign or revoke server and channel groups for a
client directly from its context menu, with per-group checkboxes
gated by the client's actual TS3 permissions (i_group_needed_member_
add/remove_power vs. each group's n_member_addp/removep, including
TS3's -1 "unlimited" sentinel). A "Server Groups Dialog..." entry
shows every server group, graying out ones the client can't touch.
Group membership changes now update ClientEntry locally instead of
only logging them, so the checkboxes and dialog reflect a change
immediately instead of needing a reconnect. The server's default
channel group (e.g. "Guest") is hidden from the channel-group menu
since it's not something you assign directly.
Extract mic/speaker/away/commander state handling into
ServerTabSelfState, ServerTreePanel.Actions delegation (context
menus, drag-drop, link clicks) into ServerTabTreeActions, and
ConnectionListener event marshaling onto the EDT into
ServerTabConnectionEvents. ServerTab keeps its full public API
(636 -> 377 lines); no behavior change.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
