* feat(sync): unify Google auth under :Pending auth Problem: users had to run `:Pending gtasks auth` and `:Pending gcal auth` separately, producing two token files and two browser consents for the same Google account. Solution: introduce `oauth.google_client` with combined tasks + calendar scopes and a single `google_tokens.json`. Remove per-backend `auth`/`setup` from `gcal` and `gtasks`; add top-level `:Pending auth` that prompts with `vim.ui.select` and delegates to the shared client's `setup()` or `auth()` based on credential availability. * docs: update vimdoc for unified Google auth Problem: `doc/pending.txt` still documented per-backend `:Pending gtasks auth` / `:Pending gcal auth` commands and separate token files, which no longer exist after the auth unification. Solution: add `:Pending auth` entry to COMMANDS and a new `*pending-google-auth*` section covering the shared PKCE flow, combined scopes, and `google_tokens.json`. Remove `auth` from gcal/gtasks action tables and update all cross-references to use `:Pending auth`. * ci: format |
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