Strip unused modules and remove all external dependencies

[babanikrishna]

Summary

• Remove unused modules: Giphy wrapper, Recording, Attachments (grid/editor/fullscreen), Link Preview, NetworkMonitor, AVPlayer+State
• Delete example projects: ChatExample/, ChatFirestoreExample/, Tests/
• Remove all 4 external SPM dependencies: MediaPicker, ActivityIndicatorView, giphy-ios-sdk, Kingfisher
• Replace Kingfisher with lightweight URLSession + NSCache-based CachedAsyncImage
• Simplify InputView to text + send only (no recording, giphy, media picker, camera)
• Package now has zero external dependencies while preserving the full public API used by Giggles

What's kept

• ChatView + all public modifiers (.chatTheme, .enableLoadMore, .showDateHeaders, .messageUseMarkdown, .keyboardDismissMode, .onMessageReaction)
• Message, User, Attachment, ReplyMessage, DraftMessage, Recording, Reaction models
• MessageMenu, ReactionBubble, ReactionSelectionView, ReactionOverview
• Theming (ChatTheme, ChatThemeColors)
• UIList scroll engine, messageBuilder closure API

Stats

• 161 files changed, 315 insertions, 10,495 deletions
• 22 source files removed, 2 example projects removed, test suite removed

Test plan

• Standalone package builds for iOS Simulator (xcodebuild -scheme Chat, zero errors)
• Giggles project builds with stripped package (BUILD SUCCEEDED)
• Verify messaging UI works end-to-end on device/simulator

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