* fix(view): reapply column highlights after paste and buffer edits
Problem: Column extmarks (icon color, per-character permissions) are
applied via `util.set_highlights` only during `render_buffer`. Neovim
does not duplicate extmarks on yank/paste, so lines inserted via `yyp`
or `p` render without any column highlights.
Solution: Store `col_width` and `col_align` in `session[bufnr]` after
each render. Add `M.reapply_highlights` which re-parses all buffer
lines, reconstructs the column chunk table, and re-applies extmarks via
`util.set_highlights`. Wire it to a `TextChanged` autocmd (guarded by
`_rendering[bufnr]` to skip oil's own `nvim_buf_set_lines` calls).
* fix(view): resolve LuaLS warnings in `reapply_highlights`
* feat(config): add per-host/bucket extra args for SSH, S3, and FTP
Problem: `extra_scp_args`, `extra_s3_args`, and `extra_curl_args` are
global — there's no way to pass adapter-specific args only to a single
host or bucket (e.g. `-O` for a Synology NAS that requires legacy SCP
protocol, or `--endpoint-url` for an R2 bucket).
Solution: add `ssh_hosts`, `s3_buckets`, and `ftp_hosts` config tables
that map exact hostnames/bucket names to per-target arg lists. Per-target
args are appended after the global args at call time. The `scp()` helper
in `ssh.lua` accepts a `hosts` list so cross-host copies deduplicate
host lookups. `create_s3_command` in `s3fs.lua` extracts the bucket from
the command args with no call-site changes needed. `resolved_curl_args`
in `ftp.lua` is called by both `curl()` and `ftpcmd()`.
Based on: stevearc/oil.nvim#607
e387a57c0e