refactor: STCP connections as ETCP links (is_tcp)

- Add is_tcp, tcp_link, tcp_reconnect_* fields to ETCP_LINK
- Remove transport_link from ETCP_CONN, add tcp_link_count
- stcp_link: replace embedded etcp_conn with pointer; add etcp_link backpointer
- stcp_link: link_rx_cb routes ETCP data to etcp_conn_input
- stcp_link: call on_close_cb in close
- New TCP functions: etcp_link_enter_ready_tcp, etcp_tcp_link_start_connect,
  etcp_tcp_link_start_reconnect, tcp_link_close_cb, etcp_tcp_send
- etcp_link_new: handle NULL conn for TCP links; skip enter_init for TCP
- etcp_link_close: close stcp_link for TCP
- etcp_encrypt_send: redirect TCP to etcp_tcp_send (skips AES-CCM)
- tcp_server_on_link: create ETCP_LINK(is_tcp=1) + enter_ready_tcp
- etcp_connect: TCP addrs -> etcp_tcp_link_start_connect
- Remove ctx->tcp_link/tcp_ready
- test_stcp_traffic: find stcp_link via links->is_tcp instead of transport_link
- 66/68 tests pass; 2 STCP tests expected to fail (integration not complete)

tools/chatgui/src/animtimer.cpp

@@ -1,61 +0,0 @@
-#include "animtimer.h"
-#include "lottieicon.h"
-#include "debug_ui.h"
-
-AnimTimer::AnimTimer() {
-    m_timer.setInterval(33);
-    connect(&m_timer, &QTimer::timeout, this, &AnimTimer::onTimer);
-    m_timer.start();
-}
-
-AnimTimer *AnimTimer::instance() {
-    static AnimTimer s;
-    return &s;
-}
-
-void AnimTimer::shutdown() {
-    instance()->m_timer.stop();
-    instance()->m_icons.clear();
-    DEBUG_INFO(DEBUG_CATEGORY_GENERAL, "AnimTimer: shutdown");
-}
-
-void AnimTimer::registerIcon(const QString &key, LottieIcon *icon) {
-    m_icons.insert(key, icon);
-}
-
-void AnimTimer::unregisterIcon(const QString &key) {
-    m_icons.remove(key);
-}
-
-LottieIcon *AnimTimer::icon(const QString &key) const {
-    return m_icons.value(key, nullptr);
-}
-
-void AnimTimer::activate() {
-    if (m_activeRef++ == 0) {
-        for (auto *icon : m_icons)
-            icon->advanceFrame();
-        emit ticked();
-    }
-}
-
-void AnimTimer::deactivate() {
-    if (m_activeRef > 0) m_activeRef--;
-}
-
-void AnimTimer::onTimer() {
-    if (m_activeRef <= 0) return;
-    for (auto *icon : m_icons)
-        icon->advanceFrame();
-    emit ticked();
-}
-
-void AnimTimer::logRegisteredIcons() const {
-    for (auto it = m_icons.constBegin(); it != m_icons.constEnd(); ++it) {
-        LottieIcon *icon = it.value();
-        GUI_INFO("LottieIcon: path=%s frames=%d size=%dx%d tgsSize=%d valid=%d",
-                 qPrintable(it.key()), icon->frameCount(),
-                 icon->originalSize().width(), icon->originalSize().height(),
-                 icon->tgsSize(), (int)icon->isValid());
-    }
-}