Prompt Optimizer v2.6.0

Summary

Added MiniMax provider support and made advanced model configuration easier to manage.
Improved temporary-variable editing, model management, and XML result inspection across the app.
Smoothed several cross-workspace interactions so model changes and feedback flows behave more reliably.

MiniMax became a first-class provider, making it easier to test and run more model combinations in one workspace.
The model manager and temporary-variable tools became much more usable for heavier prompt iteration workflows.
XML outputs are now easier to inspect thanks to an auto-rendered collapsible tree view.

Refined the model manager layout and cards so text, image, and function models feel more consistent and easier to scan.
Improved the temporary variables panel with a better editing experience, variable renaming, and a fullscreen editor that uses dialog space more effectively.
Added automatic XML rendering with a collapsible tree so structured outputs are easier to inspect without leaving the app.
Kept model lists in sync across workspaces after manager updates and tightened typed feedback payload handling.

Added MiniMax provider support, including OpenAI-compatible integration and initial default-model coverage.
Deduplicated shared TextModelConfig typing so model configuration behavior is easier to maintain.
Preserved enabled-state choices and cleaned up model version label formatting.

Fixed model-list synchronization after manager changes so other workspaces reflect updates more reliably.
Fixed scroll-jump issues in the fullscreen variable editor.
Fixed several model-manager interaction details, including enabled-choice persistence and clearer version labels.

None. Existing workspaces and saved data should continue to work without migration.

This version is a foundation release for the later model-management and evaluation work shipped in v2.6.1 and v2.6.2.
If you track when MiniMax provider support and the XML tree inspector first landed, v2.6.0 is the right release baseline.