Fix markdown paste and reload fidelity

Author: ChristianChiarulli

docs/markdown-fixtures/05-edge-cases.after-reload.expected.md

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+# Edge Cases Test Note
+
+## Empty Lines Between Content
+
+Paragraph one.
+
+
+Two blank lines above (should create one empty paragraph).
+
+
+
+Three blank lines above (should create two empty paragraphs).
+
+## Code Block With Special Characters
+
+```html
+<div class="container" data-theme="dark">
+  <h1>Hello & "World"</h1>
+  <p>x < y && y > z</p>
+  <img src="attachment://abc123.png" alt="test" />
+</div>
+```
+
+## Code Block Without Language
+
+```
+This is a plain code block
+with no language specified
+  and some indentation
+```
+
+## Inline Code With Special Chars
+
+Use `<div class="foo">` for the container. The expression `x && y || z` is truthy. Access the value with `map["key"]`.
+
+## Nested Formatting
+
+This has **bold with *italic inside* it** and *italic with **bold inside** it*.
+
+Here's ~~strikethrough with **bold** inside~~ and **bold with ~~strikethrough~~ inside**.
+
+## Links and Images
+
+Here's a [regular link](https://example.com) and a [link with title](https://example.com "Example Site").
+
+![A test image](attachment://abc123def456.png)
+
+## Blockquote
+
+> This is a blockquote.
+> It spans multiple lines.
+>
+> And has a second paragraph.
+
+## Horizontal Rule
+
+Content above the rule.
+
+---
+
+Content below the rule.
+
+## Hashtags
+
+Regular #hashtag in a paragraph.
+
+Don't create hashtags in `#inline-code` or in code blocks:
+
+```css
+.color { background: #default; }
+#header { color: #333; }
+```
+
+## Numbers and Special Patterns
+
+Phone: 555-0123
+Price: $49.99
+Percentage: 85%
+Email-like: user@example.com
+Path: /usr/local/bin
+
+## Long Paragraph
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt.

docs/markdown-fixtures/05-edge-cases.immediate-paste.expected.md

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+# Edge Cases Test Note
+
+## Empty Lines Between Content
+
+Paragraph one.
+
+
+Two blank lines above (should create one empty paragraph).
+
+
+
+Three blank lines above (should create two empty paragraphs).
+
+## Code Block With Special Characters
+
+```html
+<div class="container" data-theme="dark">
+  <h1>Hello & "World"</h1>
+  <p>x < y && y > z</p>
+  <img src="attachment://abc123.png" alt="test" />
+</div>
+```
+
+## Code Block Without Language
+
+```
+This is a plain code block
+with no language specified
+  and some indentation
+```
+
+## Inline Code With Special Chars
+
+Use `<div class="foo">` for the container. The expression `x && y || z` is truthy. Access the value with `map["key"]`.
+
+## Nested Formatting
+
+This has **bold with *italic inside* it** and *italic with **bold inside** it*.
+
+Here's ~~strikethrough with **bold** inside~~ and **bold with ~~strikethrough~~ inside**.
+
+## Links and Images
+
+Here's a [regular link](https://example.com) and a [link with title](https://example.com "Example Site").
+
+![A test image](attachment://abc123def456.png)
+
+## Blockquote
+
+> This is a blockquote.
+> It spans multiple lines.
+>
+> And has a second paragraph.
+
+## Horizontal Rule
+
+Content above the rule.
+
+---
+
+Content below the rule.
+
+## Hashtags
+
+Regular #hashtag in a paragraph.
+
+Don't create hashtags in `#inline-code` or in code blocks:
+
+```css
+.color { background: #default; }
+#header { color: #333; }
+```
+
+## Numbers and Special Patterns
+
+Phone: 555-0123
+Price: $49.99
+Percentage: 85%
+Email-like: user@example.com
+Path: /usr/local/bin
+
+## Long Paragraph
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt.

docs/markdown-fixtures/README.md

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+# Markdown Fixture Expectations
+
+These are manual fixture expectations for Comet's markdown editor when the
+same note goes through different editor paths.
+
+## `05-edge-cases`
+
+There are two valid expected outputs for this fixture:
+
+1. Immediate paste/copy round-trip
+
+   Use [05-edge-cases.immediate-paste.expected.md](/Users/chris/Repos/project/comet/docs/markdown-fixtures/05-edge-cases.immediate-paste.expected.md).
+
+   This covers:
+   - paste markdown into Comet
+   - copy it back out without navigating away from the note
+
+   Expectation:
+   - bare email text copies back out as plain text
+   - the editor may render the email as a link immediately on paste
+   - current paste path uses frontend `marked` import rules
+
+2. After reload / navigate away and back
+
+   Use [05-edge-cases.after-reload.expected.md](/Users/chris/Repos/project/comet/docs/markdown-fixtures/05-edge-cases.after-reload.expected.md).
+
+   This covers:
+   - save note state
+   - leave the note
+   - reopen the note
+   - copy/export again
+
+   Expectation:
+   - bare email text still copies back out as plain text
+   - the in-editor note may render the email as a link after reload because the
+     current load path uses Rust `comrak` with autolink enabled
+
+## UI-only expectation
+
+For the blockquote in `05-edge-cases`, the editor must allow the caret to land
+on the blank quoted line between the two paragraphs. This is an editor-structure
+expectation, not a markdown diff expectation.