feat(themes): add executive-slate professional dark theme

Leveraged Nano Banana to generate a 4k functional minimalist wallpaper. Added the new preset with a solid, high-legibility waybar and flat rofi launcher.

themes/executive-slate/rofi.rasi

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+/* 
+ * Executive Slate Rofi Theme
+ * Clean, flat, functional, professional.
+ */
+
+* {
+    background-color: transparent;
+    text-color: var(text, #D4DAE8);
+    font: "Inter 13";
+}
+
+window {
+    width: 600px;
+    background-color: var(base, #1A1D24);
+    border: 1px solid var(overlay, #333947);
+    border-radius: 4px;
+    padding: 16px;
+}
+
+mainbox {
+    spacing: 12px;
+}
+
+inputbar {
+    background-color: var(surface, #232731);
+    border: 1px solid var(overlay, #333947);
+    border-radius: 4px;
+    padding: 10px 14px;
+    spacing: 10px;
+    children: [ prompt, entry ];
+}
+
+prompt {
+    text-color: var(accent, #4D78CC);
+}
+
+entry {
+    placeholder: "Type to filter...";
+    placeholder-color: var(subtext, #8792A6);
+}
+
+listview {
+    lines: 7;
+    spacing: 4px;
+    scrollbar: false;
+    border: 0px;
+}
+
+element {
+    padding: 8px 14px;
+    border-radius: 4px;
+    spacing: 12px;
+}
+
+element normal.normal, element alternate.normal {
+    background-color: transparent;
+}
+
+/* Functional highlight: solid surface color with a subtle accent edge */
+element selected.normal {
+    background-color: var(surface, #232731);
+    text-color: var(text, #D4DAE8);
+    border: 0 0 0 4px solid;
+    border-color: var(accent, #4D78CC);
+}
+
+element-icon {
+    size: 24px;
+    background-color: transparent;
+}
+
+element-text {
+    background-color: transparent;
+    vertical-align: 0.5;
+}
+
+element-text selected {
+    text-color: var(text, #D4DAE8);
+}

themes/executive-slate/waybar.css

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+/* Executive Slate Waybar — Solid, functional, professional */
+
+* {
+  font-family: "Inter", "Symbols Nerd Font", sans-serif;
+  font-size: 13px;
+  font-weight: 500;
+  border: none;
+  border-radius: 0;
+  min-height: 0;
+}
+
+window#waybar {
+  background: @base;
+  border-bottom: 1px solid @mantle;
+  color: @text;
+}
+
+/* Tightly packed modules for a functional feel */
+.modules-left,
+.modules-center,
+.modules-right {
+  margin: 0;
+  padding: 0;
+}
+
+#workspaces button,
+#window,
+#clock,
+#tray,
+#pulseaudio,
+#battery,
+#custom-notification,
+#custom-vpn,
+#custom-powerprofile,
+#custom-updates,
+#custom-doctor {
+  padding: 0 10px;
+  margin: 0;
+  border-radius: 0;
+}
+
+/* Subtle hover effects */
+#workspaces button {
+  color: @subtext;
+  transition: all 0.2s ease-in-out;
+  border-bottom: 2px solid transparent;
+}
+
+#workspaces button:hover {
+  background: @surface;
+  color: @text;
+}
+
+/* Active gets a strong underline instead of a glowing background */
+#workspaces button.active {
+  color: @text;
+  background: @surface;
+  border-bottom: 2px solid @accent;
+}
+
+#workspaces button.urgent {
+  color: @bad;
+  border-bottom: 2px solid @bad;
+}
+
+/* Minimal indicators */
+#battery.charging { color: @good; }
+#battery.warning:not(.charging) { color: @warn; }
+#battery.critical:not(.charging) {
+  color: @bad;
+  background: @surface;
+  border-bottom: 2px solid @bad;
+}
+
+#pulseaudio.muted { color: @muted; }
+#custom-updates { color: @accentAlt; }
+#custom-doctor { color: @bad; }
+#custom-vpn { color: @accent; }
+
+/* Functional tooltip */
+tooltip {
+  background: @base;
+  border: 1px solid @overlay;
+  border-radius: 4px;
+}
+tooltip label {
+  color: @text;
+}