Add GPT 5 support

[tysonthomas9]

• Add GPT 5 support

[Copilot]

Pull Request Overview

This PR adds support for GPT-5 models to the AI chat panel by introducing new GPT-5 model variants and updating the codebase to handle them. The changes also include improvements to schema-based extraction tools and version updates.

• Adds GPT-5, GPT-5 Mini, and GPT-5 Nano models with August 2025 release dates
• Updates model cache handling to always use the latest hardcoded model list
• Simplifies schema extraction by removing legacy format support

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
AIChatPanel.ts	Adds new GPT-5 model options and updates cache handling to always use latest defaults
SchemaBasedExtractorTool.ts	Removes legacy schema format support and simplifies parameter handling
Version.ts	Updates version to 0.3.0 and build date to reflect new release
OpenAIProvider.ts	Adds GPT-5 model definitions and treats them like O-series for parameter compatibility

[Copilot]

The model ID has been changed to 'gpt-5-2025-04-14' but the name field still shows 'GPT-4.1'. This creates inconsistency between the model ID and display name.

Suggested change

	name: 'GPT-4.1',
	name: 'GPT-5',

[Copilot]

The model ID has been changed to 'gpt-5-mini-2025-04-14' but the name field still shows 'GPT-4.1 Mini'. This creates inconsistency between the model ID and display name.

Suggested change

	name: 'GPT-4.1 Mini',
	name: 'GPT-5 Mini',

[Copilot]

The model ID has been changed to 'gpt-5-nano-2025-04-14' but the name field still shows 'GPT-4.1 Nano'. This creates inconsistency between the model ID and display name.

Suggested change

	name: 'GPT-4.1 Nano',
	name: 'GPT-5 Nano',