advance shell integration and session support

shell/ferese-shell/assets/icons/battery.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="none">
+  <rect x="1.4" y="5.5" width="15.4" height="9" rx="2.4" stroke="currentColor" stroke-width="1.8"/>
+  <path d="M18 8.1c.6.2 1 .8 1 1.5v.8c0 .7-.4 1.3-1 1.5V8.1Z" fill="currentColor"/>
+  <rect x="3.8" y="7.9" width="10.6" height="4.2" rx="1" fill="currentColor"/>
+</svg>

shell/ferese-shell/assets/icons/overview.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor">
+  <rect x="1.5" y="2" width="7.2" height="6.2" rx="1.7"/>
+  <rect x="11.3" y="2" width="7.2" height="9.2" rx="1.7"/>
+  <rect x="1.5" y="10.8" width="7.2" height="7.2" rx="1.7"/>
+  <rect x="11.3" y="13.8" width="7.2" height="4.2" rx="1.7"/>
+</svg>

shell/ferese-shell/assets/icons/volume.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round">
+  <path d="M2 8.1v3.8c0 .8.6 1.4 1.4 1.4h2.1l4 3.3c.6.5 1.5.1 1.5-.7V4.1c0-.8-.9-1.2-1.5-.7l-4 3.3H3.4C2.6 6.7 2 7.3 2 8.1Z" fill="currentColor" stroke="none"/>
+  <path d="M13.4 7.2a4.1 4.1 0 0 1 0 5.6"/>
+  <path d="M16 4.8a7.4 7.4 0 0 1 0 10.4"/>
+</svg>

shell/ferese-shell/assets/icons/wifi.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="none" stroke="currentColor" stroke-width="2.15" stroke-linecap="round">
+  <path d="M2.1 7.2a12.1 12.1 0 0 1 15.8 0"/>
+  <path d="M5.2 10.5a7.4 7.4 0 0 1 9.6 0"/>
+  <path d="M8.3 13.7a2.7 2.7 0 0 1 3.4 0"/>
+  <circle cx="10" cy="16.6" r="1.25" fill="currentColor" stroke="none"/>
+</svg>