fix(cw): repair FFT pipeline (NaN twiddle table + dead cond_22 path)

The waterfall showed mirrored/upside-down garbage because the FFT
never produced a valid spectrum:
1. g3.c.f() (high-precision sin) had its quadrant-0 case mangled by
   jadx into a nested-if that returned NaN for small angles - the
   twiddle factor table ended up with 329/1024 NaN entries.
   Restored the smali switch: case0->g(), case1->c(), case2->-g(),
   case3->-c().
2. i3.d.k() routed the runtime FFT (a5==0, single-thread path) into
   the else of if(a5!=1) instead of if(a5!=0), so the FFT never ran
   and the output stayed in the time domain (peak at bin 357 for a
   669Hz tone instead of bin 86).

Verified with a JVM harness (static-block tables + pure-tone inputs):
200Hz->bin26, 400Hz->bin51, 669Hz->bin86, 1000Hz->bin128, all exact.
Twiddle table NaN count: 329 -> 0.

feature/cw/src/main/java/i3/d.java

@@ -1211,7 +1211,8 @@ public final class d {
                                 throw null;
                             }
                         }
-                    } else {
+                    }
+                } else {
                         // smali cond_22(a5==0, k=1 时运行时路径!): 单线程 FFT + 后处理
                         // jadx 原把这段错塞进 if(i8!=1) 的 else(死代码), a5==0 的 else 是幻觉(throw null)
                         int i26 = this.f11700a;
@@ -1264,4 +1265,3 @@ public final class d {
             }
         }
     }
-}