[client] UI refactor (#6069)

Refactor UI

---------

Co-authored-by: Eduard Gert <kontakt@eduardgert.de>
Co-authored-by: braginini <bangvalo@gmail.com>
Co-authored-by: Pascal Fischer <32096965+pascal-fischer@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: riccardom <riccardomanfrin@gmail.com>

client/ui/tray_theme_linux.go

@@ -0,0 +1,134 @@
+//go:build linux && !(linux && 386)
+
+package main
+
+// Wails v3's Linux SNI backend ignores SetDarkModeIcon (it just calls setIcon,
+// last write wins) and SNI carries no panel dark/light hint, so we detect the
+// desktop colour scheme ourselves and pick the silhouette in iconForState.
+// The live watcher is in tray_theme_watcher_linux.go.
+
+import (
+	"bufio"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+
+	log "github.com/sirupsen/logrus"
+)
+
+// startTrayTheme seeds t.panelDark and repaints on colour-scheme flips. Must
+// run before the first applyIcon so the initial paint uses the right silhouette.
+func (t *Tray) startTrayTheme() {
+	w := startThemeWatcher(func() { t.applyIcon() })
+	t.panelDark = w.IsDark
+}
+
+// isKDE reports whether the current desktop is KDE Plasma. XDG_CURRENT_DESKTOP
+// is a colon-separated list (e.g. "ubuntu:KDE"), so match per token.
+func isKDE() bool {
+	for _, d := range strings.Split(os.Getenv("XDG_CURRENT_DESKTOP"), ":") {
+		if strings.EqualFold(strings.TrimSpace(d), "KDE") {
+			return true
+		}
+	}
+	return false
+}
+
+// kdeglobalsPath returns the user kdeglobals path. We read only this file, not
+// the full XDG_CONFIG_DIRS cascade: Plasma writes the active scheme here, and a
+// missing Complementary group falls back to the portal.
+func kdeglobalsPath() string {
+	if dir := os.Getenv("XDG_CONFIG_HOME"); dir != "" {
+		return filepath.Join(dir, "kdeglobals")
+	}
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return ""
+	}
+	return filepath.Join(home, ".config", "kdeglobals")
+}
+
+// kdePanelIsDark reports whether the KDE Plasma panel is dark by the luma of
+// its "Complementary" background (the colour Plasma paints the tray with). ok
+// is false when this isn't KDE or the colour can't be read, so the caller falls
+// through to the portal/GTK path.
+func kdePanelIsDark() (dark, ok bool) {
+	if !isKDE() {
+		return false, false
+	}
+	path := kdeglobalsPath()
+	if path == "" {
+		return false, false
+	}
+	rgb, ok := readKdeComplementaryBackground(path)
+	if !ok {
+		return false, false
+	}
+	return isDarkRGB(rgb[0], rgb[1], rgb[2]), true
+}
+
+// readKdeComplementaryBackground parses kdeglobals for
+// [Colors:Complementary] BackgroundNormal and returns its R,G,B (0-255).
+func readKdeComplementaryBackground(path string) (rgb [3]uint8, ok bool) {
+	f, err := os.Open(path)
+	if err != nil {
+		log.Debugf("tray theme: kdeglobals open failed, using portal: %v", err)
+		return rgb, false
+	}
+	defer func() { _ = f.Close() }()
+
+	const group = "[Colors:Complementary]"
+	inGroup := false
+	scanner := bufio.NewScanner(f)
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+		if strings.HasPrefix(line, "[") {
+			inGroup = line == group
+			continue
+		}
+		if !inGroup {
+			continue
+		}
+		key, val, found := strings.Cut(line, "=")
+		if !found || strings.TrimSpace(key) != "BackgroundNormal" {
+			continue
+		}
+		return parseRGB(strings.TrimSpace(val))
+	}
+	return rgb, false
+}
+
+// parseRGB parses KDE's "r,g,b" colour triple into bytes.
+func parseRGB(s string) (rgb [3]uint8, ok bool) {
+	parts := strings.Split(s, ",")
+	if len(parts) != 3 {
+		return rgb, false
+	}
+	for i, p := range parts {
+		n, err := strconv.Atoi(strings.TrimSpace(p))
+		if err != nil || n < 0 || n > 255 {
+			return rgb, false
+		}
+		rgb[i] = uint8(n)
+	}
+	return rgb, true
+}
+
+// isDarkRGB reports whether a colour is dark via Rec. 601 luma, split at the
+// 128 midpoint.
+func isDarkRGB(r, g, b uint8) bool {
+	luma := (299*int(r) + 587*int(g) + 114*int(b)) / 1000
+	return luma < 128
+}
+
+// gtkThemeIsDark inspects the GTK_THEME env var. Empty (no override) is treated
+// as dark to match the default-dark fallback used elsewhere.
+func gtkThemeIsDark() bool {
+	theme := os.Getenv("GTK_THEME")
+	if theme == "" {
+		return true
+	}
+	// GTK_THEME is "Name[:variant]"; the dark variant is ":dark".
+	return strings.Contains(strings.ToLower(theme), ":dark")
+}