fix(printers): page de test en auto-detection MIME, noms sanitaires compacts, actions en flex_row

La page de test est un template de banniere cups-filters (#PDF-BANNER), pas du PostScript: envoi en application/octet-stream pour laisser CUPS detecter le format. Le sanitiseur supprime crochets/parentheses et compacte les underscores (series [32C998] -> series_32C998). Les actions des details passent en flex_row pour eviter le debordement des boutons; bouton de confirmation du dialogue raccourci.

cosmic-settings/src/pages/printers/backend.rs

@@ -113,7 +113,9 @@ pub fn print_test_page_sync(printer: &str) -> Result<(), String> {
     let dest = cups_rs::get_destination(printer).map_err(|err| err.to_string())?;
     let job = cups_rs::create_job(&dest, "COSMIC Settings test page")
         .map_err(|err| err.to_string())?;
-    job.submit_file(TEST_PAGE, "application/postscript")
+    // Let CUPS sniff the format: the test page is a cups-filters PDF banner
+    // template, not PostScript.
+    job.submit_file(TEST_PAGE, "application/octet-stream")
         .map_err(|err| err.to_string())
 }
 
@@ -177,21 +179,29 @@ pub async fn set_enabled(name: &str, enabled: bool) -> Result<(), String> {
 /// Sanitize a display name into a valid CUPS queue name and make it unique
 /// against the current printer list.
 pub fn unique_name(raw: &str, existing: &[Printer]) -> String {
-    let sanitized: String = raw
-        .chars()
-        .map(|c| {
-            if c.is_alphanumeric() || matches!(c, '-' | '_' | '.') {
-                c
+    let mut sanitized = String::with_capacity(raw.len());
+    for c in raw.chars() {
+        if c.is_alphanumeric() {
+            sanitized.push(c);
+        } else if matches!(c, '[' | ']' | '(' | ')') {
+            // Brackets usually wrap a model identifier; drop them so
+            // "series [32C998]" becomes "series_32C998", not "series__32C998_".
+            continue;
         } else {
-                '_'
+            sanitized.push('_');
+        }
     }
-        })
-        .collect();
 
-    let base = if sanitized.is_empty() {
+    let base = sanitized
+        .split('_')
+        .filter(|part| !part.is_empty())
+        .collect::<Vec<_>>()
+        .join("_");
+
+    let base = if base.is_empty() {
         "Printer".to_string()
     } else {
-        sanitized
+        base
     };
 
     let mut candidate = base.clone();

cosmic-settings/src/pages/printers/mod.rs

@@ -112,7 +112,7 @@ impl page::Page<crate::pages::Message> for Page {
     fn dialog(&self) -> Option<Element<'_, crate::pages::Message>> {
         let Dialog::RemovePrinter { name } = self.dialog.as_ref()?;
 
-        let confirm = widget::button::destructive(fl!("printers-remove"))
+        let confirm = widget::button::destructive(fl!("printers-remove-confirm-button"))
             .on_press(crate::pages::Message::from(Message::ConfirmRemove));
 
         let cancel = widget::button::standard(fl!("cancel"))
@@ -711,7 +711,11 @@ fn selected_printer_section() -> Section<crate::pages::Message> {
                     .apply(Element::from),
             );
 
-            column = column.add(widget::row::with_children(actions).spacing(spacing.space_s));
+            column = column.add(
+                widget::flex_row(actions)
+                    .spacing(spacing.space_s)
+                    .width(Length::Fill),
+            );
 
             column.apply(Element::from)
         })

i18n/en/cosmic_settings.ftl

@@ -675,6 +675,7 @@ printers-not-accepting = Not accepting jobs
 printers-pause = Pause
 printers-remove = Remove printer
 printers-remove-confirm = Remove this printer?
+printers-remove-confirm-button = Remove
 printers-remove-confirm-description = “{ $name }” will be removed from this system. Print jobs queued on it will be discarded.
 printers-resume = Resume
 printers-state = State

i18n/fr/cosmic_settings.ftl

@@ -463,6 +463,7 @@ printers-not-accepting = N'accepte pas les travaux
 printers-pause = Suspendre
 printers-remove = Supprimer l'imprimante
 printers-remove-confirm = Supprimer cette imprimante ?
+printers-remove-confirm-button = Supprimer
 printers-remove-confirm-description = « { $name } » sera supprimée du système. Les travaux en attente sur cette imprimante seront abandonnés.
 printers-resume = Reprendre
 printers-state = État