feat(app): clear all events from the Event Center (red trash icon)

Adds Cmd::ClearEvents + Evt::EventsCleared: the daemon drops the persistent
event log (keeping next_id monotonic), persists, and broadcasts so every
client empties its list. A red trash icon next to 'Mark all read' triggers it;
disabled when the list is empty. Threaded through proto, the daemon handler,
the Tauri bridge, and socketBridge. Includes an EventLog::clear test.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

crates/spacesh-proto/src/message.rs

@@ -124,6 +124,7 @@ pub enum Cmd {
         limit: Option<u32>,
     },
     MarkRead { target: MarkReadTarget },
+    ClearEvents,
     SetZoom {
         workspace_id: WorkspaceId,
         #[serde(default, skip_serializing_if = "Option::is_none")]
@@ -163,6 +164,7 @@ pub enum Evt {
     State { surface_id: SurfaceId, state: SurfaceState },
     Event { record: EventRecord },
     EventsRead { ids: Vec<u64> },
+    EventsCleared,
     ConfigChanged { config: crate::config_view::ConfigView },
 }
 

crates/spaceshd/src/event_log.rs

@@ -88,6 +88,11 @@ impl EventLog {
         changed
     }
 
+    /// Drop all records. `next_id` stays monotonic so ids are never reused.
+    pub fn clear(&mut self) {
+        self.records.clear();
+    }
+
     pub fn unread_count(&self) -> u32 {
         self.records.iter().filter(|r| !r.read).count() as u32
     }
@@ -164,6 +169,18 @@ mod tests {
         assert!(log.mark_read(&MarkReadTarget::All).is_empty());
     }
 
+    #[test]
+    fn clear_drops_records_but_keeps_next_id() {
+        let mut log = EventLog::new(10);
+        rec(&mut log, "s_1", EventKind::Done);
+        rec(&mut log, "s_2", EventKind::Done);
+        log.clear();
+        assert_eq!(log.recent(None).len(), 0);
+        assert_eq!(log.unread_count(), 0);
+        // ids continue from where they were — no reuse after a clear.
+        assert_eq!(rec(&mut log, "s_3", EventKind::Done).id, 3);
+    }
+
     #[test]
     fn snapshot_restore_preserves_next_id_and_records() {
         let mut log = EventLog::new(10);

crates/spaceshd/src/server.rs

@@ -648,6 +648,13 @@ async fn handle_request(
             let _ = out.send(ok(id, serde_json::Value::Null)).await;
         }
 
+        Cmd::ClearEvents => {
+            event_log.clear();
+            event_persister.mark_dirty(event_log.snapshot());
+            broadcast_evt(clients, &Envelope::Evt(Evt::EventsCleared));
+            let _ = out.send(ok(id, serde_json::Value::Null)).await;
+        }
+
         Cmd::Shutdown => {
             let _ = out.send(ok(id, serde_json::Value::Null)).await;
             std::process::exit(0);