[PATCH datacenter-manager] ui: auto-installer: filter by country name and code

[Christian Ebner <c.ebner@proxmox.com>]

The country filed for answer files expects a 2 character country
code as input, while showing the full country name for items. The
filter therefore currently applies to country codes only, not
matching on country (common) names.

Filter based on both, matching name or country code instead.

Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
---
Note:
Developt on top of [0] to reduce conflicts when applying.

[0] https://lore.proxmox.com/pdm-devel/20260526113310.289789-1-s.sterz@proxmox.com/T/

 .../auto_installer/prepared_answer_form.rs       | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/ui/src/remotes/auto_installer/prepared_answer_form.rs b/ui/src/remotes/auto_installer/prepared_answer_form.rs
index c1d2bab..793f41c 100644
--- a/ui/src/remotes/auto_installer/prepared_answer_form.rs
+++ b/ui/src/remotes/auto_installer/prepared_answer_form.rs
@@ -171,6 +171,22 @@ pub fn render_global_options_form(
                     }
                 })
                 .value(config.country.clone())
+                .filter(|item: &AttrValue, query: &str| {
+                    let query = query.to_string().to_lowercase();
+                    let item = item.to_string();
+
+                    // match by country code
+                    if item.starts_with(&query) {
+                        return true;
+                    }
+
+                    // match by country (common) name
+                    if let Some(name) = COUNTRY_INFO.deref().get(&item) {
+                        return name.to_lowercase().starts_with(&query);
+                    }
+
+                    false
+                })
                 .autoselect_filter(true)
                 .required(true),
         )
-- 
2.47.3