fix: remove duplicacao de comentario na troca de responsavel e corrige avatar

- Remove criacao automatica de comentario ao trocar responsavel (ja aparece na timeline)
- Adiciona migration removeAssigneeChangeComments para limpar comentarios antigos
- Adiciona campos description, type, options, answer ao schema de checklist no mapper
- Cria mutation updateAvatar no Convex para sincronizar avatar com snapshots
- Atualiza rota /api/profile/avatar para sincronizar com Convex ao adicionar/remover foto

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tests/change-assignee-comment.test.ts

@@ -1,29 +0,0 @@
-import { describe, expect, it } from "bun:test"
-
-import { buildAssigneeChangeComment } from "../convex/tickets"
-
-describe("buildAssigneeChangeComment", () => {
-  it("inclui nomes antigos e novos e quebra o motivo em parágrafos", () => {
-    const html = buildAssigneeChangeComment("Transferir para o time B\nCliente solicitou gestor.", {
-      previousName: "Ana",
-      nextName: "Bruno",
-    })
-
-    expect(html).toContain("Ana")
-    expect(html).toContain("Bruno")
-    expect(html).toContain("<p>Transferir para o time B</p>")
-    expect(html).toContain("<p>Cliente solicitou gestor.</p>")
-  })
-
-  it("escapa caracteres perigosos", () => {
-    const html = buildAssigneeChangeComment("<script>alert(1)</script>", {
-      previousName: "<Ana>",
-      nextName: "Bruno & Co",
-    })
-
-    expect(html).toContain("&lt;Ana&gt;")
-    expect(html).toContain("Bruno &amp; Co")
-    expect(html).not.toContain("<script>")
-  })
-})
-