from pathlib import Path

files = [
    Path(r"C:\Users\jan\Downloads\sdr-wideband-suite\web\app.js"),
    Path(r"C:\Users\jan\Downloads\sdr-wideband-suite\web\index.html"),
    Path(r"C:\Users\jan\Downloads\sdr-wideband-suite\web\style.css"),
]

repl = {
    '·': '·',
    '…': '…',
    '—': '—',
    '–': '–',
    '→': '→',
    'â†\x90': '←',
    'â– ': '■',
    'â– ': '■',
    '×': '×',
    'â•\x90': '═',
    '─': '─',
}

for p in files:
    s = p.read_text(encoding='utf-8')
    o = s
    for a, b in repl.items():
        s = s.replace(a, b)
    if s != o:
        p.write_text(s, encoding='utf-8', newline='')