fix: use gear model column for brew card grinder display

The grinder_model field was computed by splitting the concatenated
"make model" string on the first space, which broke for multi-word
brand names like "Weber Workshops". Fetch g_grinder.model directly
from the database instead.

src/domain/coffee/brews.rs

@@ -97,6 +97,7 @@ pub struct BrewWithDetails {
     pub roast_slug: String,
     pub roaster_slug: String,
     pub grinder_name: String,
+    pub grinder_model: String,
     pub brewer_name: String,
     pub filter_paper_name: Option<String>,
 }

src/infrastructure/repositories/coffee/brews.rs

@@ -18,6 +18,7 @@ const BASE_SELECT: &str = r"
         r.name as roast_name, r.slug as roast_slug,
         rr.name as roaster_name, rr.slug as roaster_slug,
         (g_grinder.make || ' ' || g_grinder.model) as grinder_name,
+        g_grinder.model as grinder_model,
         (g_brewer.make || ' ' || g_brewer.model) as brewer_name,
         (g_fp.make || ' ' || g_fp.model) as filter_paper_name
     FROM brews br
@@ -118,6 +119,7 @@ impl SqlBrewRepository {
             roast_slug: record.roast_slug,
             roaster_slug: record.roaster_slug,
             grinder_name: record.grinder_name,
+            grinder_model: record.grinder_model,
             brewer_name: record.brewer_name,
             filter_paper_name: record.filter_paper_name,
         }
@@ -325,6 +327,7 @@ struct BrewWithDetailsRecord {
     roaster_name: String,
     roaster_slug: String,
     grinder_name: String,
+    grinder_model: String,
     brewer_name: String,
     filter_paper_name: Option<String>,
 }

src/presentation/web/views/brews.rs

@@ -102,10 +102,7 @@ impl BrewView {
             roaster_slug: brew.roaster_slug,
             coffee_weight: format_weight(brew.brew.coffee_weight),
             grinder_id: brew.brew.grinder_id.into_inner(),
-            grinder_model: brew
+            grinder_model: brew.grinder_model,
-                .grinder_name
-                .split_once(' ')
-                .map_or_else(|| brew.grinder_name.clone(), |(_, model)| model.to_string()),
             grinder_name: brew.grinder_name,
             grind_setting: format!("{:.1}", brew.brew.grind_setting),
             brewer_id: brew.brew.brewer_id.into_inner(),
@@ -225,6 +222,9 @@ pub struct BrewDetailView {
     // Map
     pub map_countries: String,
     pub map_max: u32,
+    // Slugs (for breadcrumbs)
+    pub roaster_slug: String,
+    pub roast_slug: String,
     // Dates
     pub created_date: String,
     pub created_time: String,
@@ -256,6 +256,8 @@ impl BrewDetailView {
             id: brew.brew.id.to_string(),
             roast_name: brew.roast_name,
             roaster_name: brew.roaster_name,
+            roaster_slug: roaster.slug.clone(),
+            roast_slug: roast.slug.clone(),
             origin: coffee.origin,
             origin_flag: coffee.origin_flag,
             region: coffee.region,