dev/screenshots: the tooling for the README screenshots

take.sh builds arr-tui, starts a fake Radarr, Sonarr and SABnzbd with a
made-up library (catalog.py, server.py, generated posters), and runs the
scene scripts in Ghostty under Xvfb, writing docs/screenshots/. Run on the
same day it reproduces the committed pictures byte for byte. make test
also shellchecks the scripts.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019reK4DUGYqDUjniWYJvwUW

dev/screenshots/scenes/config.txt

@@ -0,0 +1,5 @@
+# The Config view; the API keys are masked.
+sleep 2
+key F6
+sleep 3
+shot config

dev/screenshots/scenes/episodes.txt

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+# The seasons and episodes of Signal Fire (5th series).
+sleep 2
+key F3
+sleep 3
+key Tab
+key Down Down Down Down
+sleep 1
+key Return
+sleep 3
+shot episodes

dev/screenshots/scenes/light.txt

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+# The library in the light theme, Neon Harbour (7th movie) selected.
+sleep 2
+key F3
+sleep 3
+key Down Down Down Down Down Down
+sleep 2
+shot library-light

dev/screenshots/scenes/views.txt

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+# Search, library, releases, downloads and calendar, in the dark theme.
+sleep 2
+key F1
+type orbit
+sleep 3
+shot search
+key F3
+sleep 3
+# The Long Orbit, 13th in the list
+key Down Down Down Down Down Down Down Down Down Down Down Down
+sleep 2
+shot library
+key i
+sleep 3
+shot releases
+key Escape
+key F4
+sleep 4
+shot downloads
+key F5
+sleep 3
+key Down
+sleep 2
+shot calendar