Feat: better user feedback on patterns page

src/state/playback.rs

@@ -130,6 +130,34 @@ impl PlaybackState {
         self.soloed.contains(&(bank, pattern))
     }
 
+    pub fn has_armed(&self) -> bool {
+        !self.staged_changes.is_empty()
+            || !self.staged_mute_changes.is_empty()
+            || !self.staged_prop_changes.is_empty()
+    }
+
+    pub fn armed_summary(&self) -> Option<String> {
+        let play = self.staged_changes.iter().filter(|c| matches!(c.change, PatternChange::Start { .. })).count();
+        let stop = self.staged_changes.iter().filter(|c| matches!(c.change, PatternChange::Stop { .. })).count();
+        let mute = self.staged_mute_changes.iter().filter(|c| matches!(c, StagedMuteChange::ToggleMute { .. })).count();
+        let solo = self.staged_mute_changes.iter().filter(|c| matches!(c, StagedMuteChange::ToggleSolo { .. })).count();
+        let props = self.staged_prop_changes.len();
+
+        let parts: Vec<String> = [
+            (play, "play"),
+            (stop, "stop"),
+            (mute, "mute"),
+            (solo, "solo"),
+            (props, "props"),
+        ]
+        .into_iter()
+        .filter(|(n, _)| *n > 0)
+        .map(|(n, label)| format!("{n} {label}"))
+        .collect();
+
+        if parts.is_empty() { None } else { Some(parts.join(", ")) }
+    }
+
     pub fn is_effectively_muted(&self, bank: usize, pattern: usize) -> bool {
         if self.muted.contains(&(bank, pattern)) {
             return true;