Add semantic color system for containers and codecs

Implements professional color taxonomy based on NLE/broadcast conventions:
- Container colors (MKV teal, MP4 blue, MOV indigo, etc.)
- Video codec colors (AV1 emerald, HEVC lime, H.264 sky blue, etc.)
- Audio codec colors (Opus violet, AAC purple, FLAC magenta, etc.)
- Pixel format colors (yuv420p slate, HDR cyan, etc.)

Helper functions to retrieve colors by format/codec name.
Foundation for color-coded UI badges in Convert module.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

internal/ui/colors.go

@@ -0,0 +1,133 @@
+package ui
+
+import (
+	"image/color"
+
+	"git.leaktechnologies.dev/stu/VideoTools/internal/utils"
+)
+
+// Semantic Color System for VideoTools
+// Based on professional NLE and broadcast tooling conventions
+
+// Container / Format Colors (File Wrapper)
+var (
+	ColorMKV    = utils.MustHex("#00B3B3") // Teal / Cyan - Neutral, modern, flexible container
+	ColorMP4    = utils.MustHex("#3B82F6") // Blue - Widely recognised, consumer-friendly
+	ColorMOV    = utils.MustHex("#6366F1") // Indigo - Pro / Apple / QuickTime lineage
+	ColorAVI    = utils.MustHex("#64748B") // Grey-Blue - Legacy container
+	ColorWEBM   = utils.MustHex("#22C55E") // Green-Teal - Web-native
+	ColorTS     = utils.MustHex("#F59E0B") // Amber - Broadcast / transport streams
+	ColorM2TS   = utils.MustHex("#F59E0B") // Amber - Broadcast / transport streams
+)
+
+// Video Codec Colors (Compression Method)
+// Modern / Efficient Codecs
+var (
+	ColorAV1    = utils.MustHex("#10B981") // Emerald - Modern, efficient
+	ColorHEVC   = utils.MustHex("#84CC16") // Lime-Green - Modern, efficient
+	ColorH265   = utils.MustHex("#84CC16") // Lime-Green - Same as HEVC
+	ColorVP9    = utils.MustHex("#22D3EE") // Green-Cyan - Modern, efficient
+)
+
+// Established / Legacy Video Codecs
+var (
+	ColorH264   = utils.MustHex("#38BDF8") // Sky Blue - Compatibility
+	ColorAVC    = utils.MustHex("#38BDF8") // Sky Blue - Same as H.264
+	ColorMPEG2  = utils.MustHex("#EAB308") // Yellow-Amber - Legacy / broadcast
+	ColorDivX   = utils.MustHex("#FB923C") // Muted Orange - Legacy
+	ColorXviD   = utils.MustHex("#FB923C") // Muted Orange - Legacy
+	ColorMPEG4  = utils.MustHex("#FB923C") // Muted Orange - Legacy
+)
+
+// Audio Codec Colors (Secondary but Distinct)
+var (
+	ColorOpus   = utils.MustHex("#8B5CF6") // Violet - Modern audio
+	ColorAAC    = utils.MustHex("#7C3AED") // Purple-Blue - Common audio
+	ColorFLAC   = utils.MustHex("#EC4899") // Magenta - Lossless audio
+	ColorMP3    = utils.MustHex("#F43F5E") // Rose - Legacy audio
+	ColorAC3    = utils.MustHex("#F97316") // Orange-Red - Surround audio
+	ColorVorbis = utils.MustHex("#A855F7") // Purple - Open codec
+)
+
+// Pixel Format / Colour Data (Technical Metadata)
+var (
+	ColorYUV420P = utils.MustHex("#94A3B8") // Slate - Standard
+	ColorYUV422P = utils.MustHex("#64748B") // Slate-Blue - Intermediate
+	ColorYUV444P = utils.MustHex("#475569") // Steel - High quality
+	ColorHDR     = utils.MustHex("#06B6D4") // Cyan-Glow - HDR content
+	ColorSDR     = utils.MustHex("#9CA3AF") // Neutral Grey - SDR content
+)
+
+// GetContainerColor returns the semantic color for a container format
+func GetContainerColor(format string) color.Color {
+	switch format {
+	case "mkv", "matroska":
+		return ColorMKV
+	case "mp4", "m4v":
+		return ColorMP4
+	case "mov", "quicktime":
+		return ColorMOV
+	case "avi":
+		return ColorAVI
+	case "webm":
+		return ColorWEBM
+	case "ts", "m2ts", "mts":
+		return ColorTS
+	default:
+		return color.RGBA{100, 100, 100, 255} // Default grey
+	}
+}
+
+// GetVideoCodecColor returns the semantic color for a video codec
+func GetVideoCodecColor(codec string) color.Color {
+	switch codec {
+	case "av1":
+		return ColorAV1
+	case "hevc", "h265", "h.265":
+		return ColorHEVC
+	case "vp9":
+		return ColorVP9
+	case "h264", "avc", "h.264":
+		return ColorH264
+	case "mpeg2":
+		return ColorMPEG2
+	case "divx", "xvid", "mpeg4":
+		return ColorDivX
+	default:
+		return color.RGBA{100, 100, 100, 255} // Default grey
+	}
+}
+
+// GetAudioCodecColor returns the semantic color for an audio codec
+func GetAudioCodecColor(codec string) color.Color {
+	switch codec {
+	case "opus":
+		return ColorOpus
+	case "aac":
+		return ColorAAC
+	case "flac":
+		return ColorFLAC
+	case "mp3":
+		return ColorMP3
+	case "ac3":
+		return ColorAC3
+	case "vorbis":
+		return ColorVorbis
+	default:
+		return color.RGBA{100, 100, 100, 255} // Default grey
+	}
+}
+
+// GetPixelFormatColor returns the semantic color for a pixel format
+func GetPixelFormatColor(pixfmt string) color.Color {
+	switch pixfmt {
+	case "yuv420p", "yuv420p10le":
+		return ColorYUV420P
+	case "yuv422p", "yuv422p10le":
+		return ColorYUV422P
+	case "yuv444p", "yuv444p10le":
+		return ColorYUV444P
+	default:
+		return ColorSDR
+	}
+}