settings: pages edit a draft, and Save writes it

The qtmaildir, Assistant and Ask presets pages wrote a field on Enter,
and a switch or chip the moment it was clicked, so a half-finished
change reached the file and a slip could not be taken back. They now
edit a draft as fields are typed, and a Save and Discard pair in the
page header (SaveBar, through Page.actions) writes or drops it. Save
waits while a field holds a value that cannot be written, and a draft
over a file that changed on disk meanwhile is refused at Save rather
than written over it. A dot in the sidebar marks a page with unsaved
edits; drafts survive moving between pages. The four Mail pages share
one draft, since they are one file. Tool switches are staged too and
renamed on Save; model Load, Prefer and Restart stay immediate, being
actions rather than settings.

Live editing needed two rules. A field is no longer bound to its value,
which would reset the cursor and eat a typed trailing space; it follows
the value only when the draft moves under it. And a Repeater's model is
now the set of row keys (or a count), assigned only when that set
changes: an array rebuilt from the draft on each keystroke recreates
every row, including the one being typed in, which loses its focus.

Git, autostart's rows, HyprSunset, HyprIdle and User keep their own
buttons.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/desktop/modules/qtmaildir/README.md b/desktop/modules/qtmaildir/README.md
index 250ceb3..e74d9cc 100644
--- a/desktop/modules/qtmaildir/README.md
+++ b/desktop/modules/qtmaildir/README.md
@@ -17,9 +17,12 @@ Four settings pages, under Mail, for qtmaildir's
 
 qtmaildir reads the file at startup and never writes it, so editing it
 under a running qtmaildir is safe; the pages say when it is running and a
-change waits for its restart. A field saves on Enter, and emptied it unsets
-the key, so qtmaildir's default applies; the placeholders name those
-defaults, from qtmaildir's README. Numbers are range-checked before writing.
+change waits for its restart. Every field, switch and row edits one draft
+shared by the four pages, and Save in any page's header writes it all;
+Discard drops it. Emptied, a field unsets the key, so qtmaildir's default
+applies; the placeholders name those defaults, from qtmaildir's README.
+Numbers are range-checked, and a refused one holds Save back. A save over a
+file changed on disk since the draft began is refused rather than lost.
 
 `Ini.js` edits the file a line at a time so its comments and order survive:
 a key unset is commented out with `;`, a commented key set again is