html: fix <search> tag handling to correctly close <p> tag

[Volentie]

This PR ensures that the <search> tag correctly closes an open <p> tag when
encountered during parsing.

The changes include:

• Adding <search> to the list of elements that should close an open <p>
  tag in parse.go.
• Registering <search> as an atom in atom.go.
• Adding a test case in parse_test.go to verify the expected behavior.
• Running tests and confirming that table.go was updated accordingly.

These modifications align with proper HTML parsing behavior and ensure
consistency with other block-level elements.

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Patch Set 1:

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Patch Set 4:

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