ProtonBridge v1.1.7-rc.1

1.1.7-rc.1 — fix Proton preview revision lookup

• Pin the rclone engine to b8c5405e.
  Fix the new preview request introduced in 1.1.6 that could return Proton HTTP
  422 / Code 2501 before any transfer. Resolve legacy file metadata through the
  existing revision-history route without requesting a block range or block URLs.
• Refresh the unique active revision for every legacy listing, even when the
  folder listing advertises a stale revision ID or authenticated metadata is
  already cached. Only reuse signed metadata under the freshly selected revision
  identity; verify signatures against current keys. Never use an old Link.XAttr
  checksum or conceal an actual history/permission error with cached data.
• Retain the verified revision identity in listed file objects. Downloads check
  that identity against fresh history and stop if it changed, before fetching
  content. Preserve exact detailed-response identity checks, unknown metadata
  semantics, bounded request concurrency and signed-metadata cache limits.
• Regression coverage includes the reported rejected request, empty files,
  revision A changing to B with a stale hint and warm cache, history errors,
  invalid signed attributes and snapshot changes before download. Host engine/
  backend/bisync regressions use disposable fixtures and race checks. Android
  artifacts are built and verified separately; live-account acceptance still
  depends on retrying the installed update.
• After updating, repeat Save and preview, then review and initialise the
  failed task if recovery is required. Initialisation performs a real resync and
  can copy/overwrite files according to the selected winner; check the preview.
  No checksum bypass, automatic resync or exclusion of .nomedia is introduced.