Themes: Make the Theme Detail view div use more of the available viewport, Fix the Header and Footer in the viewport and only scroll the theme details, Prefix some more theme CSS classes. Props shaunandrews for the initial viewport patch. Fixes #25961, #26192

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Themes: Indent the HTML for proper indentation after r26519 added an extra div. See #25961, #26192

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Themes: Bail if the search term matches the currently rendered themes, Fixes the events being clobbered. Props jblz. Fixes #26347

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Themes: Remove some HTML from a new string and put it in the replacement value instead. See #25948

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Themes: Standardise on dot notation for object access in the Templates. See #25948

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