Initial commit: Paperwall, a standalone e-ink dashboard

Navidrome now-playing, clock, and weather for a Waveshare epd4in0e panel,
with a local web UI and install/uninstall scripts for the Pi.

web/app.py

@@ -0,0 +1,76 @@
+"""Flask app: status/preview page + one settings form per screen + rotation settings."""
+
+from flask import Flask, redirect, render_template, request, url_for
+
+
+def create_app(config, screens: dict, scheduler) -> Flask:
+    app = Flask(__name__)
+
+    @app.route("/")
+    def index():
+        status = scheduler.get_status()
+        return render_template(
+            "index.html",
+            status=status,
+            screens=screens,
+            rotation=config.get_rotation(),
+            navidrome_priority=config.get_navidrome_priority(),
+        )
+
+    @app.route("/actions/refresh", methods=["POST"])
+    def refresh_now():
+        scheduler.request_manual_refresh()
+        return redirect(url_for("index"))
+
+    @app.route("/actions/switch/<screen_id>", methods=["POST"])
+    def switch_now(screen_id):
+        if screen_id in screens:
+            scheduler.request_switch(screen_id)
+        return redirect(url_for("index"))
+
+    @app.route("/settings/navidrome", methods=["GET", "POST"])
+    def settings_navidrome():
+        if request.method == "POST":
+            config.update_screen_settings("navidrome", {
+                "url": request.form.get("url", "").strip(),
+                "username": request.form.get("username", "").strip(),
+                "password": request.form.get("password", ""),
+                "filter_user": request.form.get("filter_user", "").strip(),
+                "show_progress": "show_progress" in request.form,
+                "show_genre": "show_genre" in request.form,
+                "show_source": "show_source" in request.form,
+                "boost_cover": "boost_cover" in request.form,
+                "grayscale_cover": "grayscale_cover" in request.form,
+            })
+            return redirect(url_for("settings_navidrome"))
+        return render_template("settings_navidrome.html", settings=config.get_screen_settings("navidrome"))
+
+    @app.route("/settings/weather", methods=["GET", "POST"])
+    def settings_weather():
+        if request.method == "POST":
+            lat = request.form.get("latitude", "").strip()
+            lon = request.form.get("longitude", "").strip()
+            config.update_screen_settings("weather", {
+                "latitude": float(lat) if lat else None,
+                "longitude": float(lon) if lon else None,
+            })
+            return redirect(url_for("settings_weather"))
+        return render_template("settings_weather.html", settings=config.get_screen_settings("weather"))
+
+    @app.route("/settings/rotation", methods=["GET", "POST"])
+    def settings_rotation():
+        if request.method == "POST":
+            raw = request.form.get("screens", "")
+            selected = [s.strip() for s in raw.split(",") if s.strip() in screens]
+            interval = int(request.form.get("interval_seconds", 300) or 300)
+            config.set_rotation(selected, interval)
+            config.set_navidrome_priority("navidrome_priority" in request.form)
+            return redirect(url_for("settings_rotation"))
+        return render_template(
+            "settings_rotation.html",
+            screens=screens,
+            rotation=config.get_rotation(),
+            navidrome_priority=config.get_navidrome_priority(),
+        )
+
+    return app