Address follow-up review: cheaper avatars, list limits, less chatter.

Switch avatar resize to ApproxBiLinear, cap hunt/profile/admin list queries, drop redundant admin/profile lookups, dedupe CI on app PRs, and refresh stale todo.md notes.

internal/store/store.go

@@ -2,6 +2,13 @@ package store
 
 import "context"
 
+// List row caps keep hunt/profile/admin pages bounded.
+const (
+	HuntListLimit    = 100
+	ProfileListLimit = 50
+	AdminUsersLimit  = 200
+)
+
 // Store is the application persistence API used by the web layer.
 type Store interface {
 	CreateUser(ctx context.Context, u *User) error