feat(blankpad): desk.sh profile switcher, hotplug autoswitch daemon, keybinds doc generator + bats suite

- desk.sh: list/current/switch/cycle/match/capture over cfg/desk-*.kdl
  profiles; apply = relink display.kdl, niri validate (rollback on fail),
  load-config-file, noctalia notification; match scores // requires: lines
  (EDID long names) against live niri msg outputs
- desk-autoswitch.sh: watch niri msg --json event-stream for
  OutputsChanged, debounced desk.sh match --apply, reconnect loop
- blankpad-desk-autoswitch.service: ConditionHost=blankpad user unit
- gen-keybinds.sh: keybinds.kdl -> markdown cheat sheet (sections from
  // --- headers, hotkey-overlay-title preferred over action)
- tests/: 27 bats cases, all green (desk 16, gen-keybinds 6,
  niri-config 5 incl. real niri validate on the assembled tree with
  each desk profile active)

dotfiles/zz-blankpad/.config/systemd/user/blankpad-desk-autoswitch.service

@@ -0,0 +1,19 @@
+[Unit]
+Description=Desk Profile Auto-Switch for Blankpad
+After=graphical-session.target
+ConditionHost=blankpad
+
+[Service]
+Type=simple
+User=%u
+Group=%u
+ExecStart=/usr/bin/env bash %h/.omp/scripts/desk-autoswitch.sh watch
+Restart=on-failure
+RestartSec=5
+StandardOutput=journal
+StandardError=journal
+Environment=DESK_NIRI=/usr/bin/niri
+Environment=DESK_NOTIFY=noctalia msg notification-show
+
+[Install]
+WantedBy=default.target

dotfiles/zz-blankpad/.local/bin/desk.sh

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+../../../../scripts/desk.sh

dotfiles/zz-blankpad/.local/share/com.pais.handy/README.md

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+# Handy Settings Template
+
+This directory contains a template for Handy's settings store. The app rewrites the live store at `~/.local/share/com.pais.handy/settings_store.json`.
+
+Keys that might contain sensitive information (e.g., API tokens, base URLs) should stay out of the repo.

dotfiles/zz-blankpad/.local/share/com.pais.handy/settings_store.template.json

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+{
+  "// template: Handy settings store, rewritten live by the app": true,
+  "// app rewrites live store: ~/.local/share/com.pais.handy/settings_store.json": true,
+  "// keys stay out of repo": true,
+  "autostart_enabled": false,
+  "post_process_enabled": true,
+  "provider": "custom",
+  "base_url": "http://192.168.0.143:7771/v1",
+  "model": "frank-secondary",
+  "prompt": "default_improve_transcriptions",
+  "push_to_talk": true,
+  "bindings": {
+    "transcribe": "ctrl+space",
+    "transcribe_with_post_process": "ctrl+shift+space",
+    "cancel": "escape"
+  },
+  "keyboard_implementation": "handy_keys",
+  "overlay_position": "bottom",
+  "overlay_style": "live",
+  "paste_method": "none",
+  "clipboard_handling": "copy_to_clipboard"
+}