Add RetroTech creative palette for dark-mode and synthwave styling

palettes/creative/LT-Palette_RetroTech.gpl

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+GIMP Palette
+Name: RetroTech - LT Palette
+Columns: 10
+#
+# ─── BASE / NEUTRAL ───
+10 10 15       Void Black
+25 25 30       Monitor Graphite
+40 40 55       Panel Steel
+65 70 85       Interface Grey
+100 105 125    CRT Grey
+180 190 210    Screen Highlight
+
+# ─── NEON PRIMARIES ───
+255 60 80      Neon Red
+255 110 0      Hot Orange
+255 220 0      Electric Yellow
+0 255 150      Plasma Green
+0 200 255      Ion Blue
+200 100 255    Ultraviolet Purple
+255 120 255    Magenta Glow
+
+# ─── ACCENTS / EFFECTS ───
+255 255 255    Scanline White
+0 255 255      Cyan Edge
+255 160 0      Signal Amber
+255 40 0       Alarm Red
+0 120 255      Holo Blue
+255 0 150      Spectrum Pink