fix: remove context reaper to prevent background tabs from going stale

Background windows stopped updating because the reaper suspended contexts
after ContextSuspendAfter and fully reaped them after ContextTTL. Suspended
contexts had to re-run the page init function from scratch on reconnect,
losing the live-updating experience.

Contexts now live until the browser tab closes (beforeunload beacon) or
the server shuts down. The context map grows indefinitely — no background
reaper.

Removes: startReaper, reapOrphanedContexts, suspend/resume logic,
ContextSuspendAfter/ContextTTL config fields, lastSeenAt/suspended
context fields, and all associated tests.

via_test.go

@@ -400,95 +400,6 @@ func TestPage_PanicsOnNoView(t *testing.T) {
 	})
 }
 
-func TestReaperCleansOrphanedContexts(t *testing.T) {
-	v := New()
-	c := newContext("orphan-1", "/", v)
-	c.createdAt = time.Now().Add(-time.Minute) // created 1 min ago
-	v.registerCtx(c)
-
-	_, err := v.getCtx("orphan-1")
-	assert.NoError(t, err)
-
-	v.reapOrphanedContexts(5*time.Second, 10*time.Second)
-
-	_, err = v.getCtx("orphan-1")
-	assert.Error(t, err, "orphaned context should have been reaped")
-}
-
-func TestReaperSuspendsContext(t *testing.T) {
-	v := New()
-	c := newContext("suspend-1", "/", v)
-	c.createdAt = time.Now().Add(-30 * time.Minute)
-	dc := time.Now().Add(-20 * time.Minute)
-	c.sseDisconnectedAt.Store(&dc)
-	v.registerCtx(c)
-
-	v.reapOrphanedContexts(15*time.Minute, time.Hour)
-
-	got, err := v.getCtx("suspend-1")
-	assert.NoError(t, err, "suspended context should still be in registry")
-	assert.True(t, got.suspended.Load(), "context should be marked suspended")
-}
-
-func TestReaperReapsAfterTTL(t *testing.T) {
-	v := New()
-	c := newContext("reap-1", "/", v)
-	c.createdAt = time.Now().Add(-3 * time.Hour)
-	dc := time.Now().Add(-2 * time.Hour)
-	c.sseDisconnectedAt.Store(&dc)
-	c.suspended.Store(true)
-	v.registerCtx(c)
-
-	v.reapOrphanedContexts(15*time.Minute, time.Hour)
-
-	_, err := v.getCtx("reap-1")
-	assert.Error(t, err, "context past TTL should have been reaped")
-}
-
-func TestReaperIgnoresAlreadySuspended(t *testing.T) {
-	v := New()
-	c := newContext("already-sus-1", "/", v)
-	c.createdAt = time.Now().Add(-30 * time.Minute)
-	dc := time.Now().Add(-20 * time.Minute)
-	c.sseDisconnectedAt.Store(&dc)
-	c.suspended.Store(true)
-	// give it a fresh pageStopChan so we can verify it's not re-closed
-	c.pageStopChan = make(chan struct{})
-	v.registerCtx(c)
-
-	v.reapOrphanedContexts(15*time.Minute, time.Hour)
-
-	got, err := v.getCtx("already-sus-1")
-	assert.NoError(t, err, "already-suspended context within TTL should survive")
-	assert.True(t, got.suspended.Load())
-	// pageStopChan should still be open (not re-suspended)
-	select {
-	case <-got.pageStopChan:
-		t.Fatal("pageStopChan was closed — context was re-suspended")
-	default:
-	}
-}
-
-func TestReaperIgnoresConnectedContexts(t *testing.T) {
-	v := New()
-	c := newContext("connected-1", "/", v)
-	c.createdAt = time.Now().Add(-time.Minute)
-	c.sseConnected.Store(true)
-	v.registerCtx(c)
-
-	v.reapOrphanedContexts(5*time.Second, 10*time.Second)
-
-	_, err := v.getCtx("connected-1")
-	assert.NoError(t, err, "connected context should survive reaping")
-}
-
-func TestReaperDisabledWithNegativeTTL(t *testing.T) {
-	v := New()
-	v.cfg.ContextTTL = -1
-	v.startReaper()
-	assert.Nil(t, v.reaperStop, "reaper should not start with negative TTL")
-}
-
 func TestCleanupCtxIdempotent(t *testing.T) {
 	v := New()
 	c := newContext("idempotent-1", "/", v)
@@ -503,74 +414,6 @@ func TestCleanupCtxIdempotent(t *testing.T) {
 	assert.Error(t, err, "context should be removed after cleanup")
 }
 
-func TestReaperRespectsLastSeenAt(t *testing.T) {
-	v := New()
-	c := newContext("seen-1", "/", v)
-	c.createdAt = time.Now().Add(-30 * time.Minute)
-	// Disconnected 20 min ago, but client retried (lastSeenAt) 2 min ago
-	dc := time.Now().Add(-20 * time.Minute)
-	c.sseDisconnectedAt.Store(&dc)
-	seen := time.Now().Add(-2 * time.Minute)
-	c.lastSeenAt.Store(&seen)
-	v.registerCtx(c)
-
-	v.reapOrphanedContexts(15*time.Minute, time.Hour)
-
-	_, err := v.getCtx("seen-1")
-	assert.NoError(t, err, "context with recent lastSeenAt should survive suspend threshold")
-	assert.False(t, c.suspended.Load(), "context should not be suspended")
-}
-
-func TestReaperFallsBackWithoutLastSeenAt(t *testing.T) {
-	v := New()
-	c := newContext("noseen-1", "/", v)
-	c.createdAt = time.Now().Add(-30 * time.Minute)
-	dc := time.Now().Add(-20 * time.Minute)
-	c.sseDisconnectedAt.Store(&dc)
-	// no lastSeenAt set — should fall back to sseDisconnectedAt
-	v.registerCtx(c)
-
-	v.reapOrphanedContexts(15*time.Minute, time.Hour)
-
-	got, err := v.getCtx("noseen-1")
-	assert.NoError(t, err, "context should still be in registry (suspended, not reaped)")
-	assert.True(t, got.suspended.Load(), "context should be suspended using sseDisconnectedAt fallback")
-}
-
-func TestReaperReapsWithStaleLastSeenAt(t *testing.T) {
-	v := New()
-	c := newContext("stale-seen-1", "/", v)
-	c.createdAt = time.Now().Add(-3 * time.Hour)
-	dc := time.Now().Add(-2 * time.Hour)
-	c.sseDisconnectedAt.Store(&dc)
-	// lastSeenAt is also old — beyond TTL
-	seen := time.Now().Add(-90 * time.Minute)
-	c.lastSeenAt.Store(&seen)
-	c.suspended.Store(true)
-	v.registerCtx(c)
-
-	v.reapOrphanedContexts(15*time.Minute, time.Hour)
-
-	_, err := v.getCtx("stale-seen-1")
-	assert.Error(t, err, "context with stale lastSeenAt beyond TTL should be reaped")
-}
-
-func TestLastSeenAtUpdatedOnSSEConnect(t *testing.T) {
-	v := New()
-	c := newContext("seen-sse-1", "/", v)
-	v.registerCtx(c)
-
-	assert.Nil(t, c.lastSeenAt.Load(), "lastSeenAt should be nil before SSE connect")
-
-	// Simulate what the SSE handler does after getCtx
-	now := time.Now()
-	c.lastSeenAt.Store(&now)
-
-	got := c.lastSeenAt.Load()
-	assert.NotNil(t, got, "lastSeenAt should be set after SSE connect")
-	assert.WithinDuration(t, now, *got, time.Second)
-}
-
 func TestDevModeRemovePersistedFix(t *testing.T) {
 	v := New()
 	v.cfg.DevMode = true