[steverobertsuk]

This release significantly overhauls the Concentration mod, rewriting its core into ES modules with modern development tooling. It introduces a host of new features and user experience improvements, alongside comprehensive test coverage and translations into 24 languages. Version 1.0 settings, macros, and commands remain fully compatible.

Fixed:

• Concentration end messages now accurately report when a spell concludes, avoiding ambiguity.
• Player interactions with "Roll" and "Advantage" buttons are corrected to function as intended, rolling for the token's players or the GM.
• Damage detection now correctly compares HP bar values numerically, preventing misinterpretations of changes.
• One-Click settings on the Mod's page now correctly apply on startup.
• Changing the HP Bar setting no longer requires a restart of the API.
• Unlinked tokens now manage their concentration independently, resolving an issue where a single failed save affected all tokens from the same sheet.
• Whisper targeting for send_reminder_to: character now correctly uses the character's full name and includes a copy for the GM.
• Parsing of 5e OGL spell cards is improved, specifically addressing cases where charname appeared before name.

Added:

• Explicit end-of-concentration messages, including "is no longer concentrating on…", "loses concentration on…", and "drops to 0 hit points and loses concentration on…".
• Support for spell switching, allowing concentration to be shifted to a new spell with appropriate messaging.
• Manual changes to the concentration marker (adding or removing) now trigger corresponding concentration start or end events with messages.
• A new End at 0 HP setting (default on) to automatically end concentration when a token drops to 0 hit points without requiring a save.
• Concentration save DCs now cap at 30, aligning with D&D 2024 rules.
• New chat commands: end, status, help, and journal.
• Two new GM-only handouts: Concentration - Help (full instructions) and Concentration - Command Deck (buttons for all actions).
• Custom token markers can now be used for the Status Marker setting, with automatic migration of existing markers upon change.
• An extended public API (globalThis.Concentration) for other Mods, offering isConcentrating, spellOf, start, end, and list methods.
• Translations into 24 languages, configurable via a new Language setting.
• Enhanced D&D 2024 spell card detection, leveraging the message's character ID when available.
• Improved token lifecycle management: deleting concentrating tokens ends their concentration, new linked tokens of a concentrating character automatically receive the marker, and pasted marked tokens are correctly tracked.

Security:

• Spell cards now only initiate concentration for characters controlled by the sender (or from the GM and other Mods), preventing unauthorised marking by any player.

Changed:

• D&D 2024 cards that only mention "concentration" in their text (e.g., War Caster feat cards) can now start concentration but will no longer replace an existing named spell. Repeated spell cards for the current spell are now ignored.
• Chat cards now use a new, consistent style aligned with other Mods, featuring settings presented as buttons within a single card.
• The reset command now prompts for confirmation and preserves existing concentration records.
• The source code has been refactored into ES modules under src/ and bundled using Rollup.
• Developer documentation (docs/) has been integrated into README.md, TESTING.md, and DEVELOPERS.md.
• New Node.js-based test suite added for enhanced stability and easier development.

Signed-off-by: Steve Roberts steve@shadowcomputers.co.uk