More Knobs to Fiddle in v2.0.7

 LED Button Controls & Effect Knobs

This experimental release adds interactive LED buttons to all CRT control knobs and introduces three new effect controls with toggle functionality.

✨ New Features

LED Push Buttons (All Knobs)

10px diameter red LED indicator below each knob

Visual feedback system with timed flash patterns

Three press duration types:

Short press (<1 second): Reset to user default → 1 flash

Long press (1-2 seconds): Set new user default → 2 flashes

Really long press (≥2 seconds): Reset to factory default → 3 flashes

Effect Knobs (New Dark-Styled Controls)

BLOOM: Glow intensity 0-1 (default 0.3)

Short press toggles bloom effect ON/OFF

LED stays lit when effect is enabled

P-DECAY: Persistence decay rate 0-1 (default 0.5)

Short press toggles persistence decay ON/OFF

LED indicates effect state

P-FRAMES: Frame history 1-128 frames (default 3)

Short press toggles frame persistence ON/OFF

Increased maximum from 10 to 128 frames for dramatic trails

LED shows effect enabled state

Improved UX

LED state synchronization with effect enabled/disabled status

Fixed race condition between flash feedback and persistent LED state (250ms delay)

All 14 knobs (11 CRT + 3 Effect) fit perfectly in 668px panel with -22px spacing

OSD messages for all effect control changes

Auto-save settings on all control adjustments

🔧 Technical Improvements

Darker appearance for effect knobs (160-80 RGB vs 220-140) to distinguish from CRT controls

Press timing detection using Qt QTime for accurate duration measurement

Signal/slot architecture for effect toggle and value changes

Proper initialization with effects disabled by default (matching CRT display widget state)