Key Party

### Added

- Added `KeyPartySeasonData.lua` as the dedicated source for season-specific dungeon definitions, including map IDs, teleport spell IDs, and display names.

- Added UI scaling controls in the header with `+` and `-` buttons, with persistent saved scale between sessions.

- Added a bottom-right drag handle to scale the full UI frame by dragging.

- Added `/kp demo` to populate the addon with the local player plus four fictional party members for UI preview and testing.

- Added realistic demo party data, including dungeon scores, total Mythic+ rating, available keystones, and highest completed key runs.

- Added `/kp ver` and `/kp version` to report which party members are using Key Party and which addon version they have installed.

### Changed

- Season dungeon and teleport mappings are now driven from `KeyPartySeasonData.lua` instead of hardcoded season-specific entries in `KeyParty.lua`.

- Updated the bundled season data to Midnight Season 1 dungeon definitions.

- The YOUR SCORES row now derives displayed season dungeons from `KeyPartySeasonData.lua`, so the UI matches the configured season dataset explicitly.

- The title header now supports the updated banner artwork and keeps the control buttons in a dedicated strip above the banner image.

- Banner sizing now preserves the artwork aspect ratio based on the active banner texture dimensions.

- The title banner now sits inside the inner border of the frame instead of touching the outer border edge.

- The bottom status line now shows the addon version before the last refresh timestamp.

- The YOUR SCORES tiles now render the score at the bottom of the icon instead of centered.

- Key level text in YOUR SCORES tiles now uses the same color as the corresponding dungeon score.

- Increased spacing between the bottom `Auto open after dungeon finish` and `Party chat announcement Best Progression Key after dungeon finish` options while keeping all content inside the frame.

### Fixed

- Default teleport mappings from the active season file now always override stale SavedVariables mappings from older seasons.

- Corrected demo data population so seasonal dungeon map IDs are read from structured season entries, allowing highest completed key runs and per-dungeon scores to appear correctly in the UI.

- Fixed a UI load failure caused by misplaced scale button code inside the weekly affix layout block.