chore(flatpak): refresh generated sources

[github-actions]

Automated monthly refresh of the offline Flatpak source manifests.

• cargo-sources.json follows src-tauri/Cargo.lock exactly.
• node-sources.json + package-lock.json re-resolve package.json
  against the npm registry, so this also bumps transitive frontend
  dependencies for the Flathub build only — the app itself is
  built from bun.lock, the Flatpak sandbox runs npm ci --offline.

packaging/flatpak/check-sources.py passed in the generating run,
and the commit is signed (created through the Git Data API) so the
required_signatures rule doesn't block the merge.

⚠️ Opened with GITHUB_TOKEN, which by design doesn't start workflow
runs — CI has not run on this PR, and the ruleset requires code
scanning to pass. Close and reopen the PR to kick everything off, or
configure the APP_ID / APP_PRIVATE_KEY secrets so future runs open
the PR as a GitHub App and CI fires on its own.

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