https://gitlab.synchro.net/main/sbbs/-/commit/79b77e1e01d974b65af40834
Added Files:
src/syncterm/scripts/auto/connected/sftp_browser.wren
Modified Files:
src/syncterm/scripts/syncterm.wren ui_app.wren ui_popup.wren src/syncterm/wren_bind.c wren_bind_sftp.c wren_bind_sftp.h
Log Message:
SyncTERM: Wren SFTP browser

New scripts/auto/connected/sftp_browser.wren replaces the C-side
sftp_browser.c for read-only navigation of an SFTP session. Bound
to Alt-S; spawns a child fiber whose App owns the screen (CTerm
suspended while modal).

Display:
- Each row shows size, mtime, an optional `+` marker (when the
server's fattr advertises a non-empty descs@syncterm.net
extension), and a label. Directories use lname when the
server provides one; files keep their bare filename and put
lname into a bottom description bar inside the pane.
- F2 fetches the long description via the descs request and
displays it preformatted (block-centred, no per-line centring).
- Esc / [X] dismiss; F1 / [?] show help; Enter descends into
directories; .. ascends. Files don't transfer yet — that
lands with the Wren queue replacement.

C-side wiring (wren_bind_sftp.[ch], wren_bind.c):
- struct wren_sftp_entry gains has_long_desc; build_sftp_entry
populates it from sftp_fattr_get_ext_by_type(de->attrs,
SFTP_EXT_NAME_DESCS).
- SFTPEntry foreign class gains hasLongDesc accessor.

ui_app.wren:
- dispatchMouse_ now hands an unclaimed button-1 drag-start back
to the C-side selector (Input.unget(me) + Input.mousedrag()),
so the standard SyncTERM rectangle / line-copy UI works while
a Wren App is up.

ui_popup.wren:
- New splitHardLines_ helper splits on CR/LF/CRLF without
word-wrapping. longestHardLine_ now counts codepoints rather
than bytes so multi-byte UTF-8 (e.g. box-drawing) doesn't
inflate the popup width measurement.
- Popup gains a `preformatted` mode and Alert.showPreformatted:
splits only on hard breaks (no word-wrap, no mid-codepoint
splits) and left-aligns all lines at one block-column so the
block is centred while each line keeps its relative shape.
centeredBounds_ takes a preformatted flag for consistent row
counting between sizing and painting.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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