Prevent indentation after Markdown line breaks

[robzolkos]

Summary

Markdown-authored content with a hard line break included a formatting newline after <br>. HEY preserved that whitespace, making continuation lines appear indented.

Before

<p>AAA.<br>
BBB.</p>

After

<p>AAA.<br>BBB.</p>

The corrected output applies to Markdown-authored messages, drafts, forwards, and contact notes while preserving structural whitespace in paragraphs, lists, blockquotes, code blocks, and raw HTML.

Validation

• GOWORK=off make check
• GOWORK=off make build
• GOWORK=off go test -cover ./internal/htmlutil -count=1 — 93.4% statement coverage

[Copilot]

Pull request overview

Prevents Markdown line breaks from adding indentation when converted to HEY-compatible HTML.

Changes:

• Adds a Goldmark text renderer that emits <br> without trailing whitespace.
• Expands regression coverage across HTML utilities, CLI commands, drafts, and TUI composition.

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Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
internal/htmlutil/from_markdown.go	Adds whitespace-free line-break rendering.
internal/htmlutil/from_markdown_test.go	Covers breaks and structural whitespace.
internal/cmd/compose_test.go	Verifies raw HTML preservation.
internal/cmd/contacts_test.go	Updates contact-note output expectation.
internal/cmd/draft_test.go	Tests flush draft continuation lines.
internal/cmd/forward_test.go	Updates forwarded-content expectation.
internal/tui/compose_test.go	Updates TUI composition expectation.

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