Add comprehensive AI-ready SDK usage documentation

[Copilot]

Created comprehensive documentation in INJECTED_LIBRARIES.md covering all SDK patterns, injected libraries, and helper functions for AI code generation.

Changes

Core SDK Fixes

• FDOInterface: Removed incorrect parameter from init() signature (was init(sdk: FDO_SDK), now init())

Documentation Enhancements (441→776 lines)

SDK Core Patterns

• Complete plugin structure template with all required components
• Handler registration patterns (correct vs incorrect examples)
• Storage operations using StoreType interface
• DOM helper usage for all classes (Table, Text, Button, Input, Link, Media, Semantic, Nested, Misc)
• Mixins implementation (QuickAction, SidePanel)
• Error handling with decorators
• 10 common patterns summary

Injected Libraries

• Enhanced window helper documentation with TypeScript signatures
• Communication patterns (backend ↔ frontend)
• CSS frameworks: Pure CSS, Highlight.js, Notyf
• JS libraries: FontAwesome, Split Grid, ACE Editor, Goober
• Complete usage examples for each library

AI-Specific Context

• Usage context (no imports needed, browser environment)
• TypeScript configuration guide
• Best practices and common pitfalls

Example

Before: Examples showed incorrect interface implementation

export interface FDOInterface {
    init(sdk: FDO_SDK): void;  // ❌ Wrong
    render(): string;
}

After: Correct pattern with comprehensive documentation

export interface FDOInterface {
    init(): void;  // ✓ Correct
    render(): string;
}

// Full plugin template now available in docs
export default class MyPlugin extends FDO_SDK implements FDOInterface {
    init(): void {
        PluginRegistry.registerHandler('action', async (data) => {
            return { success: true, data };
        });
    }
}

Original prompt

Create a comprehensive information about SDK usage ready for usage in AI including injected libraries at INJECTED_LIBRARIES.md

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