FN-5914: fix mission activity counts and chronology

Keep mission activity counts accurate before event data loads and show events in chronological order.

- add persisted mission event counts to core mission summaries and dashboard mission summary types
- use the summary event count for the Activity tab preload badge instead of the currently loaded page total
- render mission activity oldest-to-newest, keep load-more prepends stable, and scroll to the latest event on initial/live updates
- extend mission store, dashboard, and MissionManager tests for event count and ordering coverage

Files changed:
 packages/core/src/__tests__/mission-store.test.ts  |  19 ++++
 packages/core/src/mission-store.ts                 |  24 ++++-
 packages/dashboard/app/api/legacy.ts               |   2 +
 .../dashboard/app/components/MissionManager.tsx    |  19 ++--
 .../components/__tests__/MissionManager.test.tsx   | 107 ++++++++++++++++-----
 packages/dashboard/app/components/mission-types.ts |   1 +
 .../dashboard/src/__tests__/mission-e2e.test.ts    |   7 +-
 7 files changed, 143 insertions(+), 36 deletions(-)

Fusion-Task-Id: FN-5914

Fusion-Task-Lineage: b3119e94-66bd-437d-bcde-d5e4e43cb29e

packages/core/src/__tests__/mission-store.test.ts

@@ -246,6 +246,7 @@ describe("MissionStore", () => {
         totalFeatures: 0,
         completedFeatures: 0,
         linkedGoalCount: 0,
+        eventCount: 0,
         progressPercent: 0,
       });
     });
@@ -324,6 +325,18 @@ describe("MissionStore", () => {
       expect(store.getMissionSummary(mission.id).linkedGoalCount).toBe(2);
     });
 
+    it("getMissionSummary reports unfiltered event counts", () => {
+      const mission = store.createMission({ title: "Eventful mission" });
+
+      expect(store.getMissionSummary(mission.id).eventCount).toBe(0);
+
+      store.logMissionEvent(mission.id, "mission_started", "started");
+      store.logMissionEvent(mission.id, "warning", "warning");
+      store.logMissionEvent(mission.id, "error", "error");
+
+      expect(store.getMissionSummary(mission.id).eventCount).toBe(3);
+    });
+
     it("findNextPendingSlice skips completed slices in earlier milestones", () => {
       const mission = store.createMission({ title: "Next pending" });
       const m1 = store.addMilestone(mission.id, { title: "M1" });
@@ -398,6 +411,7 @@ describe("MissionStore", () => {
         totalFeatures: 0,
         completedFeatures: 0,
         linkedGoalCount: 0,
+        eventCount: 0,
         progressPercent: 0,
       });
 
@@ -409,6 +423,7 @@ describe("MissionStore", () => {
         totalFeatures: 0,
         completedFeatures: 0,
         linkedGoalCount: 0,
+        eventCount: 0,
         progressPercent: 0,
       });
 
@@ -420,6 +435,7 @@ describe("MissionStore", () => {
         totalFeatures: 2,
         completedFeatures: 1,
         linkedGoalCount: 0,
+        eventCount: 0,
         progressPercent: 50,
       });
     });
@@ -437,6 +453,8 @@ describe("MissionStore", () => {
       createGoalInDb(db, "G-004", "Reliability");
       store.linkGoal(mission.id, "G-003");
       store.linkGoal(mission.id, "G-004");
+      store.logMissionEvent(mission.id, "mission_started", "started");
+      store.logMissionEvent(mission.id, "warning", "warning");
 
       const singleSummary = store.getMissionSummary(mission.id);
       const batchedResult = store.listMissionsWithSummaries().find((m) => m.id === mission.id)!;
@@ -446,6 +464,7 @@ describe("MissionStore", () => {
       expect(batchedResult.summary.totalFeatures).toBe(singleSummary.totalFeatures);
       expect(batchedResult.summary.completedFeatures).toBe(singleSummary.completedFeatures);
       expect(batchedResult.summary.linkedGoalCount).toBe(singleSummary.linkedGoalCount);
+      expect(batchedResult.summary.eventCount).toBe(singleSummary.eventCount);
       expect(batchedResult.summary.progressPercent).toBe(singleSummary.progressPercent);
     });
 

packages/core/src/mission-store.ts

@@ -123,6 +123,8 @@ export interface MissionSummary {
   completedFeatures: number;
   /** Number of goals linked to the mission */
   linkedGoalCount: number;
+  /** Unfiltered total number of persisted mission lifecycle events */
+  eventCount: number;
   /** Computed progress percentage (0–100), based on features or milestones */
   progressPercent: number;
 }
@@ -772,6 +774,11 @@ export class MissionStore extends EventEmitter<MissionStoreEvents> {
       .get(missionId) as { count?: number | bigint } | undefined;
     const linkedGoalCount = Number(linkedGoalRow?.count ?? 0);
 
+    const eventCountRow = this.db
+      .prepare("SELECT COUNT(*) AS count FROM mission_events WHERE missionId = ?")
+      .get(missionId) as { count?: number | bigint } | undefined;
+    const eventCount = Number(eventCountRow?.count ?? 0);
+
     let progressPercent = 0;
     if (totalFeatures > 0) {
       progressPercent = Math.round((completedFeatures / totalFeatures) * 100);
@@ -785,6 +792,7 @@ export class MissionStore extends EventEmitter<MissionStoreEvents> {
       totalFeatures,
       completedFeatures,
       linkedGoalCount,
+      eventCount,
       progressPercent,
     };
   }
@@ -829,7 +837,15 @@ export class MissionStore extends EventEmitter<MissionStoreEvents> {
       linkedGoalRows.map((row) => [row.missionId, Number(row.count ?? 0)]),
     );
 
-    // 6. Group in-memory: slices by milestoneId, features by sliceId
+    // 6. Batch query mission event counts
+    const eventCountRows = this.db.prepare(
+      "SELECT missionId, COUNT(*) AS count FROM mission_events GROUP BY missionId"
+    ).all() as Array<{ missionId: string; count?: number | bigint }>;
+    const eventCountByMissionId = new Map(
+      eventCountRows.map((row) => [row.missionId, Number(row.count ?? 0)]),
+    );
+
+    // 7. Group in-memory: slices by milestoneId, features by sliceId
     const slicesByMilestoneId = new Map<string, Slice[]>();
     for (const slice of allSlices) {
       const list = slicesByMilestoneId.get(slice.milestoneId) || [];
@@ -844,7 +860,7 @@ export class MissionStore extends EventEmitter<MissionStoreEvents> {
       featuresBySliceId.set(feature.sliceId, list);
     }
 
-    // 7. Group milestones by missionId
+    // 8. Group milestones by missionId
     const milestonesByMissionId = new Map<string, Milestone[]>();
     for (const milestone of allMilestones) {
       const list = milestonesByMissionId.get(milestone.missionId) || [];
@@ -852,7 +868,7 @@ export class MissionStore extends EventEmitter<MissionStoreEvents> {
       milestonesByMissionId.set(milestone.missionId, list);
     }
 
-    // 8. Compute summary for each mission using grouped data
+    // 9. Compute summary for each mission using grouped data
     return missions.map((mission) => {
       const milestones = milestonesByMissionId.get(mission.id) || [];
       const totalMilestones = milestones.length;
@@ -871,6 +887,7 @@ export class MissionStore extends EventEmitter<MissionStoreEvents> {
       }
 
       const linkedGoalCount = linkedGoalCountByMissionId.get(mission.id) ?? 0;
+      const eventCount = eventCountByMissionId.get(mission.id) ?? 0;
 
       let progressPercent = 0;
       if (totalFeatures > 0) {
@@ -887,6 +904,7 @@ export class MissionStore extends EventEmitter<MissionStoreEvents> {
           totalFeatures,
           completedFeatures,
           linkedGoalCount,
+          eventCount,
           progressPercent,
         },
       };