The debounceSearch() function in files.html called clearFullTextSearch()
when the query was shorter than 2 characters. Since clearFullTextSearch()
sets input.value = '', every single keystroke was immediately erased —
users could paste text but not type.
Fix: debounceSearch now only hides the results panel for short queries
without touching the input value.
Also adds a dedicated /search page with Google-style results showing
content previews (document title, filename, type badges, tag badges,
sender, and OCR text snippets with highlighted matches).
Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>