Improve sandbox handling on Linux by detecting Snap, Flatpak,
and AppImage environments and applying appropriate Chromium
command-line switches:
- If running in Snap or Flatpak, disable Chromium's sandbox
(--no-sandbox) to avoid conflicts with the distribution's
own sandboxing.
- Otherwise (traditional packages and AppImage), disable the
SUID sandbox and prefer the user namespace sandbox
(--disable-setuid-sandbox). This avoids requiring a SUID
chrome-sandbox binary and aligns with modern Linux best
practices.
Also adjust apps/electron-backend/src/main.ts to only apply
these changes on Linux (process.platform === 'linux').
Minor formatting: expand the package.json copy "filter" array
to a multiline style for readability.
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