[Milestone A] A-01: Fix whitespace text node suppression in AspxParser

[csharpfritz]

Milestone A — Parser Hardening (A-01)

Priority: P0 — Foundation
Size: Small
Branch: experiment/aspx-middleware
File: src/BlazorWebFormsComponents.AspxMiddleware/AspxParser.cs (~line 177)

Problem

The AspxParser silently drops whitespace-only text nodes via an IsNullOrWhiteSpace check. This breaks layout and spacing in rendered pages — whitespace between inline controls (e.g., <asp:Label>\ followed by <asp:TextBox>) is layout-significant in HTML.

Acceptance Criteria

• Remove or narrow the \IsNullOrWhiteSpace\ check so whitespace-only nodes are preserved as \AspxTextNode\ instances
• Preserve \n, \r\n, single spaces, and runs of spaces
• Only discard truly empty nodes ("")
• All ~52 existing tests still pass

Context

See: \dev-docs/milestones/ASPX-MIDDLEWARE-MILESTONES.md\ § Milestone A
See: \dev-docs/aspx-middleware-migration-landscape.md\ §4.1

[github-actions]

🏗️ Squad Triage — Forge (Lead / Web Forms Reviewer)

Issue: #76 — [Milestone A] A-01: Fix whitespace text node suppression in AspxParser
Assigned to: Rogue (QA Analyst)
Reason: Issue relates to testing/quality work

Team roster:

• Forge (Lead / Web Forms Reviewer) → label: squad:forge
• Cyclops (Component Dev) → label: squad:cyclops
• Beast (Technical Writer) → label: squad:beast
• Jubilee (Sample Writer) → label: squad:jubilee
• Rogue (QA Analyst) → label: squad:rogue
• Colossus (Integration Test Engineer) → label: squad:colossus
• Psylocke (Skills Engineer) → label: squad:psylocke
• Bishop (Migration Tooling Dev) → label: squad:bishop
• Ralph (Work Monitor) → label: squad:ralph

To reassign, remove the current squad:* label and add the correct one.

[github-actions]

📋 Assigned to Cyclops (Component Dev)

Issue: #76 — [Milestone A] A-01: Fix whitespace text node suppression in AspxParser

Cyclops will pick this up in the next Copilot session.

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Cyclops, work on issue #76