fix(ios): replace per-cell UITextView with single drawRect pass for tables

[hryhoriiK97]

What/Why?

Replace per-cell UITextView allocation in iOS table rendering with a single drawRect: pass, eliminating multi-second AppHangs on large tables.

Problem: Each table cell allocated a full UITextView with its own TextKit stack (NSTextStorage, NSLayoutManager, NSTextContainer). Setting the frame triggered synchronous typesetting via ensureLayoutForBounds: per cell. A 200×7 table = 1,400 UITextViews blocking the main thread — 10–85s hangs in production, including fatal watchdog kills. Both the render path (addTextToCell:) and shadow-node measurement (renderMarkdownSynchronously:) were affected.

Fix: New ENRMTableIOSGridView draws all cells in one drawRect: pass using NSAttributedString.drawWithRect: — same approach macOS already uses via ENRMTableGridView. Link handling reimplemented with on-demand TextKit hit-testing (only on tap, not per-cell on render). Shadow-node measurement now creates one lightweight view instead of 1,400 UITextViews.

Closes: #417

Testing

Screenshots

Before	After
before.mov	after.mov

PR Checklist

• Code compiles and runs on iOS
• Code compiles and runs on Android
• Updated documentation/README if applicable
• Ran example app to verify changes
• E2E tests are passing
• Required E2E tests have been added (if applicable)

[Copilot]

Pull request overview

This PR optimizes iOS table rendering by replacing per-cell UITextView creation with a single custom drawRect:-based grid view, aiming to eliminate main-thread hangs on large tables while keeping link interaction support.

Changes:

• Reworks iOS table rendering in TableContainerView to build row data and delegate drawing to a new ENRMTableIOSGridView.
• Adds ENRMTableIOSGridView / ENRMTableIOSRowData to render the whole table in one drawRect: pass and perform on-demand link hit-testing on tap/long-press.
• Updates iOS “new rows” animation to use a view-level cross-dissolve instead of per-cell alpha animations.

Reviewed changes

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

File	Description
packages/react-native-enriched-markdown/ios/views/TableContainerView.m	Switches iOS tables to a single grid view renderer; builds per-row data for drawing and updates row animation hook.
packages/react-native-enriched-markdown/ios/views/ENRMTableIOSGridView.m	New iOS grid view implementation (drawing + gesture handling + link hit-testing).
packages/react-native-enriched-markdown/ios/views/ENRMTableIOSGridView.h	Public interface for the new iOS grid view + row data container.

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[eszlamczyk]

LGTM (my tests did not find any issues + code looks good)