cue:fade — added OSC + UID + hold/delay support, improved parser, and fixed fade keyword bug

This update extends the cue:fade handler and parser with several new capabilities and fixes multiple edge-case bugs affecting target resolution and UID parsing.

• Added support for uid: argument, allowing unique identifiers for OSC messages and multi-target tracking. Defaults to the SVG element’s own id when unspecified.

• Added osc: toggle (0|1). When enabled and if window.OSC_ENABLED = true, the system now transmits OSC messages in the format:
/oscilla/fade/<uid> <value>
Continuous fade modes (in/out/inout/pulse/strobe) send normalized 0–1 values, while blink mode sends discrete 0/1 changes only.

• Added delay: parameter to defer fade start by N seconds.
• Added hold: (alias time:) to automatically stop looping fade modes after N seconds.
• Improved internal target resolution — 'self' now correctly maps to the element containing the cue trigger.

• Fixed parser bug where the 'fade' keyword token was being greedily consumed, preventing valid parsing of identifiers containing hyphens (e.g. fade-target123).

• Refined logging and auto-stop logic for looping modes (pulseSlow, pulseFast, blink, strobe).

This update completes the first fully-functional cue:fade → OSC signal chain for both visual and networked fade/pulse/blink interactions.

Author: robcanning