Final review fixes: capture state, stopJamming idempotency, code cleanup

Critical bug fixes:
- stopJamming() was returning early when jammingEnabled=false, leaving radios
  in unknown state and breaking capture when jamming was off
- stopJamming() now idempotent: always stops noise timer (+ nulls pointer),
  drives GDO0 low, puts transmitting radios to standby — safe to call anytime
- Add capPrevJamming flag saved before stopJamming() clears jammingEnabled;
  used by stopCapture() and buffer-full handler to correctly restart jamming
  after capture/replay sessions end

Code quality:
- capAnalyze() called twice per /api/capture/status request — now called once
- Remove unused JAM_NOISE_PATTERN_LEN define (leftover from LEDC era)
- Fix stale "LEDC 120 kHz square wave" comment in startJamming()
- Web UI: show rec_bits (final stored count) instead of capIdx in Bits cell;
  progress bar shows 100% when in RECORDED/REPLAYING state

Made-with: Cursor

include/config.h

@@ -30,8 +30,6 @@
 // { -30, -20, -15, -10, 0, 5, 7, 10 } dBm
 #define JAM_POWER_LEVELS      8
 #define DEFAULT_JAM_POWER_IDX 7        // index into power table (7 = 10 dBm, max)
-#define JAM_NOISE_PATTERN_LEN 64
-
 // External amplifier gain in dB (used only for display — does not affect CC1101 output)
 #define DEFAULT_AMP_GAIN_DB   20