fix: strip trailing bracket from room-window title (no more "]]")

[MahtraDR]

Problem

RoomDataProcessor#process_room_data captured the room-window title with:

@room_pending_title = text.sub(/^\[/, '').sub(/\]\s*\(/, ' (').strip

That removes the leading [ unconditionally, but only removes the closing ] when it is immediately followed by a ( — i.e. the [Room] (230008) RealID form. A bracketed title without a trailing (number) keeps its ]:

• [Bosque Deriel, Hermit's Shacks - 2071] — Lich's ;display lichid + ;display roomid title when the game RealID isn't appended → Bosque Deriel, Hermit's Shacks - 2071]
• [Town Square] — any plain room → Town Square]

RoomWindow#render then re-brackets the title ("[#{@title}]"), doubling the stray bracket into [Bosque Deriel, Hermit's Shacks - 2071]].

(Surfaced while chasing a doubled ] alongside elanthia-online/lich-5#1500; that Lich PR fixes the DR side by preserving the game RealID, but this front-end regex is independently buggy for any bracketed title lacking a trailing (number).)

Fix

Also strip a trailing ], so the captured title is always bracket-free regardless of whether the game appended a RealID:

@room_pending_title = text.sub(/^\[/, '').sub(/\]\s*\(/, ' (').sub(/\]\s*\z/, '').strip

render then adds exactly one pair of brackets.

input (roomName text)	captured title	rendered
[Room] (230008)	Room (230008)	[Room] (230008)
[Room - 2071]	Room - 2071	[Room - 2071] (was [Room - 2071]])
[Town Square]	Town Square	[Town Square] (was [Town Square]])
[Room - 2071] (230008)	Room - 2071 (230008)	[Room - 2071] (230008)

Tests

New spec/lib/room_data_processor_spec.rb drives #process_room_data in :title mode over the RealID, lich-id-only, plain, and combined title shapes, plus adversarial "leaves no stray ]" and no-RoomWindow cases.

Full suite green: 852 examples, 0 failures; rubocop clean on touched files.

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