The "top vs bottom" client label setting was cluttering the UI and
codebase with toggles that added little value. This consolidates client
label handling into one option, removes unused CLI/settings knobs, and
makes NoteView’s API consistent and fluent. Result: fewer knobs, less
branching, and a clearer, more predictable UI.
Now client labels are only shown in one place: selected notes.
- Drop `--show-client` arg in notedeck and `--show-note-client=top|bottom`
args in notedeck_columns
- Remove `NotedeckOptions::ShowClient` and related CLI parsing
- Delete `ShowSourceClientOption` enum, settings UI, and
`SettingsAction::SetShowSourceClient`
- Collapse `NoteOptions::{ClientNameTop, ClientNameBottom}` into a single
`NoteOptions::ClientName`
- Add `NoteOptions::{Framed, UnreadIndicator}`
- Move “framed” and unread indicator into flags (no more ad‑hoc bools)
- Add new NoteView builder methods: `.client_name()`, `.frame()`,
`.unread_indicator()`, and `.selected_style()`
- CLI flags for showing client labels have been removed
- `ClientNameTop`/`ClientNameBottom` replaced with `ClientName`
- API using `framed` or `show_unread_indicator` booleans must now use
the new flag setters
Signed-off-by: William Casarin <jb55@jb55.com>
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