Bump omnyshell to ^1.51.0 (1.14.7)

[gmpassos]

Bumps omnyshell from ^1.49.0 to ^1.51.0 (pulls omnydrive 1.10.0 transitively) and the app version to 1.14.7.

Upstream changes (1.49.0 → 1.51.0)

• 1.50.0 — git drives authenticate to private remotes (node/CLI only).
• 1.51.0 — "Unify git credentials under drive credential + remote management." Adds a client-side RPC path: new protocol messages, ClientRuntime.driveCredentialAdd/List/Remove, hub routing, node handling.

Web compatibility — verified clean

Web imports only package:omnyshell/omnyshell_client_web.dart. 1.51.0 touches three files inside that barrel's reachable closure (client_runtime.dart, protocol/control_message.dart, protocol/frame_codec.dart), so both angles were checked against the local 1.51.0 / omnydrive 1.10.0 sources:

• No dart:io / omnydrive leak. Transitive closure from the web barrel (honoring the _io/_web conditional seams → web compiles the _web branch): 104 files, 0 dart:io imports, 0 omnydrive edges. The new client credential API passes credentials as a plain Map<String, dynamic> (an omnydrive GitCredential JSON map), so it never imports omnydrive/dart:io types.
• Purely additive API — no new imports, nothing removed/renamed in the web-reachable files. Web code that ignores the new methods is unaffected.
• The login footer's OmnyShell v$omnyShellVersion now reads 1.51.0 automatically (no source change).

Verification

• dart pub get — resolves clean (omnyshell 1.51.0, omnydrive 1.10.0)
• dart format — 0 changed · dart analyze — No issues found
• dart run build_runner build --release — compiles clean (empirical confirmation of the dart:io-free trace)

Note: the drive credential feature is node/hub-side — nodes must run the 1.51.0 binary for it to work end-to-end. The web client only gains the (currently unused) client RPC methods.

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