Read config.toml, keys.toml and themes, and open them with :config (stage 8b)

The config folder now sets everything: config.toml the settings (now
also `theme` and `editor`), keys.toml the keys, and themes/<name>.toml
the theme, laid over the built-in one, so a theme only needs what it
changes. Each file is applied again a second after it's saved; a
mistake only drops its own line, and the status bar says what's wrong,
naming the file.

:config lists the three files with their folder; Enter hands the
terminal to your editor (the editor setting, $VISUAL, $EDITOR, else
notepad or vi), writing the file first if it's missing, with every
option at its default behind a #, explained (keys.toml lists every
command by name). :theme switches themes until cumulus quits, like
:set.

The built-in theme gets the named styles the user picked, each also put
on by its tag: question (yellow, dashed), important (red, thick) and done
(gray, its title faded); and link styles blocks and supports, whose
label shows on a link without its own. Themes can also set [modes],
[node], [root], [branch] and [link].

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/view/outline.rs

@@ -164,7 +164,8 @@ impl OutlineView {
         let (doc, theme, glyphs) = (ctx.doc, ctx.theme, ctx.theme.glyphs);
         let Some(node) = doc.node(id) else { return };
         let top_level = lines.spans.is_empty();
-        let color = theme.node_style(node, id == doc.root()).color;
+        let style = theme.node_style(node, id == doc.root());
+        let color = style.color;
         let has_children = !doc.children(id).is_empty();
         let folded = visible.hidden.contains_key(&id);
         let marker = if node.is_portal() {
@@ -184,6 +185,8 @@ impl OutlineView {
         let muted = Style::new().fg(theme.muted);
         let title_style = if id == ctx.cursor {
             Style::new().fg(Color::Black).bg(theme.accent).add_modifier(Modifier::BOLD)
+        } else if style.faded {
+            muted
         } else {
             Style::new()
         };