Fix heap fragmentation issues

- Keep-if-fits font buffer reuse (SdCardFont), the page-turn fragmentation fix
- Background-build heap floors + buildTickHeapGate() (the ParsedText::addWord abort fix), with the BLE-shed branch removed
- KOSync TLS gate split (free ≥ 50K, largest block ≥ 20K)
- wolfSSL SP ECC flags + FP_MAX_BITS 8192 in the patch script
- custom_sdkconfig: timer-stack trims (~7KB) and, per your answer, the WiFi IRAM opts (~25-30KB); plus the cloud-component removal the hybrid build requires. All verified present in the generated sdkconfig after the build.
- Web server watchdog registration fix (this branch's handlers already call esp_task_wdt_reset without it)

lib/hal/HalDisplay.h

@@ -43,12 +43,12 @@ class HalDisplay {
   // while the panel refreshes on its own. The framebuffer must stay untouched
   // until waitRefreshComplete(), and the caller must rebuild the differential
   // baseline before the next differential update (the tiled grayscale cleanup
-  // does). Panels without async support fall back to a blocking refresh.
+  // does). Panels without deferral fall back to a blocking refresh.
   void displayBufferAsync(RefreshMode mode = RefreshMode::FAST_REFRESH);
-  // Block until a pending async refresh completes (no-op when none is).
+  // Block until a pending deferred refresh completes (no-op when none is).
   void waitRefreshComplete();
-  // True when displayBufferAsync() genuinely overlaps (panel driver has real
-  // async support); false where it falls back to a blocking refresh.
+  // True when displayBufferAsync() genuinely overlaps (panel driver defers);
+  // false where it falls back to a blocking refresh.
   bool supportsAsyncRefresh() const;
   void refreshDisplay(RefreshMode mode = RefreshMode::FAST_REFRESH, bool turnOffScreen = false);