Rail without icons, FX glow chip renamed

The rail chips carried a lucide glyph before the label; drop the icons and
the icon field so the labels stand alone (the row is a plain text rail now,
and each chip is ~50px narrower). Also rename the FX knob from the
lens-vendor term to LIGHT GLOW - same key, same maths, just the label.

src/utils/paramDefs.ts

@@ -174,7 +174,7 @@ export const PARAM_DEFS: {
     },
     {
       key: 'hdf',
-      label: 'HDF',
+      label: 'LIGHT GLOW',
       min: 0,
       max: 10,
       step: 1,