Fix: Preserve multiple consecutive newlines in TipTap editor

[AJ-505]

Fix: Multiple Newlines Collapsing to Single Line

Issue

When users pressed Enter multiple times to create blank lines, only one blank line would remain after typing resumed. Multiple consecutive newlines were being collapsed into a single newline.

Root Cause

The TipTapWrapper.tsx HTML-to-blocks conversion was filtering out empty <p> elements:

// Previous code - filtered out empty paragraphs
if (content && content.trim().length > 0) {
  blocks.push({...});
}

This caused all empty paragraph nodes to be removed during the conversion process, collapsing multiple newlines.

Solution

1. HTML-to-blocks conversion: Modified to always preserve paragraph blocks, even when empty
2. Enhanced CSS: Improved empty paragraph handling with inline-block zero-width space and explicit sizing

Changes Made

• src/components/Editor/TipTapWrapper.tsx: Remove empty content filter for paragraphs
• src/index.css: Enhanced empty paragraph CSS rules

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