Fix search dialog close on touch devices (iPad without keyboard)

[Copilot]

On touch devices without a physical keyboard (e.g. iPad), there was no way to dismiss the search dialog — no ESC key, no tappable close target, and clicking outside did nothing.

Changes

• "Close [esc]" → clickable button: Converted the decorative <div> hint at the bottom of the search dialog into a <button> that closes the dialog on tap/click via this.closest('dialog').close()
• Backdrop tap-to-close: Added onclick="if(event.target===this)this.close()" to the <dialog> element so tapping outside the search panel dismisses it
• Updated both search.templ and the generated search_templ.go

- <div class="o-inline-flex o-gap-2 o-items-center o-text-sm dark:o-text-white">
+ <button onclick="this.closest('dialog').close()"
+         class="o-inline-flex o-gap-2 o-items-center o-text-sm dark:o-text-white o-cursor-pointer">
    <span class="o-text-caption">Close</span>
    @KBD("esc")
- </div>
+ </button>

ESC key and ⌘K/Ctrl+K behavior are unchanged.

Related

Closes #[issue]

Checklist

• I have read and followed the contributing guidelines
• I have updated documentation where necessary
• Existing tests pass
• Added tests for new functionality (if applicable)
• Manually verified changes work as expected
• I have considered the impact on existing functionality

Original prompt

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This section details on the original issue you should resolve

<issue_title>Closing Search Box on iPad</issue_title>
<issue_description>Hey,

First off, thanks for openchangelog, it's awesome. And this isn't anything major, but something one of us noticed and would be a nice to have fix:

On an iPad using [Apple]K to search, and ESC to close the search works fine with a keyboard…

BUT without a keyboard… touching [Apple]K to enter search, but closing the search box is not possible, as the iPad software-keyboard doesn’t have an ESC key.

Touching another part of the screen doesn’t close the search box. The [Close] and [ESC] onscreen icons aren’t currently “clickable”.

Thanks
Rob</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Closing Search Box on iPad #48

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