[docs] Scaffold reference guides + README Documentation section

- Documentation/{Extensions,SwiftUI,UIKit}.md shells with category headings + TOC
- README: Documentation table linking all 4 guides
- footer: drop the second github badge, keep the resume link

Documentation/Extensions.md

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+# LCEssentials — Extensions
+
+Foundation, value-type, string, collection, numeric, date, and crypto helpers, plus
+the `LCEssentials` namespace itself. UIKit extensions live in
+[UIKit.md](UIKit.md); SwiftUI helpers in [SwiftUI.md](SwiftUI.md).
+
+Every section is a collapsible block — click a heading to expand it.
+
+## Contents
+
+- [API & Networking](#api--networking)
+- [Strings & Text](#strings--text)
+- [Collections & Sequences](#collections--sequences)
+- [Numbers & Geometry](#numbers--geometry)
+- [Date, Data & Files](#date-data--files)
+- [Encoding & Errors](#encoding--errors)
+- [Crypto](#crypto)
+- [Core — the `LCEssentials` namespace](#core--the-lcessentials-namespace)
+
+---
+
+## API & Networking
+
+<!-- batch 2 -->
+
+## Strings & Text
+
+<!-- batch 3 -->
+
+## Collections & Sequences
+
+<!-- batch 4 -->
+
+## Numbers & Geometry
+
+<!-- batch 5 -->
+
+## Date, Data & Files
+
+<!-- batch 6 -->
+
+## Encoding & Errors
+
+<!-- batch 7 -->
+
+## Crypto
+
+<!-- batch 2 -->
+
+## Core — the `LCEssentials` namespace
+
+<!-- batch 7 -->

Documentation/SwiftUI.md

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+# LCEssentials — SwiftUI
+
+SwiftUI components and `View` helpers. Foundation/value-type helpers are in
+[Extensions.md](Extensions.md); UIKit-era helpers in [UIKit.md](UIKit.md).
+
+Every section is a collapsible block — click a heading to expand it.
+
+## Contents
+
+- [Navigation](#navigation)
+- [View helpers](#view-helpers)
+
+---
+
+## Navigation
+
+<!-- batch 8 -->
+
+## View helpers
+
+<!-- batch 8 -->

Documentation/UIKit.md

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+# LCEssentials — UIKit
+
+UIKit-era helpers: programmatic layout & constraints, view/control extensions,
+navigation, table/collection helpers, and drop-in components (image picker, image
+zoom, snackbar, GIF loading).
+
+Foundation/value-type helpers are in [Extensions.md](Extensions.md); SwiftUI
+helpers in [SwiftUI.md](SwiftUI.md).
+
+Every section is a collapsible block — click a heading to expand it.
+
+## Contents
+
+- [Layout & Constraints](#layout--constraints)
+- [Views & Controls](#views--controls)
+- [Navigation & Controllers](#navigation--controllers)
+- [Collections & Tables](#collections--tables)
+- [Media & Components](#media--components)
+
+---
+
+## Layout & Constraints
+
+<!-- batch 9 -->
+
+## Views & Controls
+
+<!-- batch 10 -->
+
+## Navigation & Controllers
+
+<!-- batch 11 -->
+
+## Collections & Tables
+
+<!-- batch 12 -->
+
+## Media & Components
+
+<!-- batch 13 -->