feat: add Queue Repeat extension

src/extensions/queue-repeat/README.md

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++![Queue Repeat preview](Foto.png)
+
+# Queue Repeat — Spicetify Extension
+
+A lightweight Spicetify extension that adds a **Queue Repeat** toggle button to Spotify's player bar. When enabled, every track that finishes playing from your queue is automatically re-added to the end of the queue — creating a seamless, infinite loop of your manually queued tracks.
+
+## Features
+
+- **Toggle button** placed directly to the left of the Lyrics button in the bottom player bar
+- **Active / Inactive state** — green highlight with an indicator dot when on, dimmed when off
+- **Snapshot on activation** — when you press the button, the extension reads the current track and all queued tracks and registers them as the repeat list
+- **Dynamic queue detection** — tracks added to the queue *after* enabling Queue Repeat are automatically picked up and included in the repeat loop (checked every 2 seconds)
+- **Smart injection** — survives Spotify DOM re-renders via MutationObserver
+- **No comments, no bloat** — clean production-ready code
+
+## How It Works
+1. Add tracks to "Next Up" (queue) as usual
+2. Press the Queue Repeat button in the player bar
+3. The extension captures: current track + all queued tracks → repeat list
+4. Each time a track from the repeat list finishes → it is re-added to the end of the queue
+5. Result: your queued tracks loop indefinitely
+6. Press the button again to turn it off (queue is left unchanged)
+
+While active:
+  → Every 2 seconds, the extension checks for newly added tracks
+  → If a new track appears in the queue, it is added to the repeat list automatically
+
+## Preview
+
+| State | Appearance |
+|---|---|
+| **Off** | Icon is dimmed (grey, 60% opacity) |
+| **On** | Icon turns **green** + small green dot indicator beneath it |
+
+Notifications:
+- `Queue Repeat on (N tracks)` — shown when enabled
+- `Queue Repeat: N new track(s) added` — shown when a new track is detected while active
+- `Queue Repeat off` — shown when disabled
+
+## Installation
+### Steps
+
+**1. Copy the extension file**
+
+Place `queue-repeat.js` into your Spicetify extensions folder:
+
+```
+%APPDATA%\spicetify\Extensions\queue-repeat.js
+```
+
+**2. Register the extension**
+
+```powershell
+spicetify config extensions queue-repeat.js
+```
+
+**3. Apply**
+
+```powershell
+spicetify apply
+```
+
+Spotify will restart automatically with the extension active.
+
+---
+
+## Uninstall
+
+```powershell
+spicetify config extensions queue-repeat.js-
+spicetify apply
+```
+
+Then delete the file from the Extensions folder.
+
+
+## File Structure
+
+```
+Extensions/
+└── queue-repeat.js     ← the extension (single file, no dependencies)
+```
+
+---

src/extensions/queue-repeat/manifest.json

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+{
+  "name": "Queue Repeat",
+  "description": "Loop tracks added to the manual queue",
+  "main": "queue-repeat.js",
+  "authors": ["Malik"],
+  "readme": "README.md",
+  "version": "1.0.0",
+  "preview": "Foto.png"
+}