v0.4.3 : persistance du theme actif choisi

- le REPL 'theme <name>' applique ET sauvegarde le theme (settings.theme dans le fichier de config actif, cree s'il manque) via persist_setting
- correction racine : config::merge ignorait settings.theme - la valeur persistee n etait jamais relue au chargement, le theme par defaut etait toujours reapplique apres un redemarrage
- 'am --theme <name>' reste un one-shot ; config set settings.theme <nom> fonctionne egalement
- aides mises a jour (banniere, help theme)
- tests de persistance + relecture au demarrage, man pages regenerees, version 0.4.3

src/help.rs

@@ -940,7 +940,7 @@ pub static HELP_SPECS: &[HelpSpec] = &[
         name: "theme",
         category: "Shell",
         usage: "theme {flags} [name]",
-        about: "Show the color themes, or switch the active one inside the shell.",
+        about: "Show the color themes, or switch the active one inside the shell (the choice is saved to the config).",
         search_terms: &["color", "colors", "palette"],
         flags: &[],
         subcommands: &[],
@@ -950,7 +950,7 @@ pub static HELP_SPECS: &[HelpSpec] = &[
         io: None,
         examples: &[
             HelpExample { desc: "List the available themes.", code: "theme" },
-            HelpExample { desc: "Switch to the ocean theme.", code: "theme ocean" },
+            HelpExample { desc: "Switch to the ocean theme (kept for the next start).", code: "theme ocean" },
         ],
     },
     HelpSpec {
@@ -1386,7 +1386,7 @@ pub fn render_general(theme: &Theme, color: bool) -> String {
     out.push_str(&format!("  {bullet} help <name> - display help about a particular command or agent\n"));
     out.push_str(&format!("  {bullet} help --find <text to search> - search through all help commands table\n"));
     out.push_str(&format!(
-        "  {bullet} am --theme <name> - choose a color theme ({})\n",
+        "  {bullet} theme <name> - switch the color theme (saved) · am --theme <name> for a one-shot ({})\n",
         crate::theme::names().join(", ")
     ));
     out.push('\n');