Add tests and search simulator TUI

tests/notes/aka-variants.md

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+aka lowercase alias
+
+Content for lowercase alias.
+
+---
+
+AKA: uppercase alias
+
+This later alias must not be promoted because only the first paragraph is inspected.

tests/notes/colon-variants.md

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+Introductory paragraph.
+
+Colon heading:
+- item one
+- item two
+
+Not a heading: this is inline content.
+
+Another colon heading:
+
+Its content starts after a blank line.
+
+Trailing text.

tests/notes/fork-features.md

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+# Fork Feature Fixture
+Aka: Packing List
+
+This body contains Sun's BBQ and a blank-line excerpt target.
+
+
+The café serves crème brûlée in Montréal.
+
+Japan trip:
+- passport
+- cash
+- umbrella
+
+Words such as a an the and or but if in on at by for with to from of is it that this should not be useful search terms.
+
+The apostrophe phrase Sun's BBQ appears again for highlighting.

tests/notes/headers-and-lists.md

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+# H1 Heading
+
+This note has a first-level heading and useful body content.
+
+## H2 Heading
+
+The second-level section has searchable material.
+
+### H3 Heading
+
+- first H3 list item
+- second H3 list item
+
+#### H4 Heading
+
+H4 content is intentionally present too.
+
+##### H5 Heading
+
+H5 content and a [link](https://example.com).
+
+###### H6 Heading
+
+- nested item
+  - nested child
+
+A final paragraph mentions heading terms in ordinary content.

tests/notes/title-priority.md

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+# Title Priority Fixture
+
+The title-priority term appears in body content after the heading.
+
+## Heading Priority Fixture
+
+The heading-priority term appears in ordinary content too.
+
+Content-only match appears here.