Teach the launcher what an operating system knows

The OS-parity batch from the vicinae plan, tasks 1 through 7. The audit
came back better than the plan guessed: the calculator already links
libqalculate, the built-in file index answers in under 100ms across all
of home, quicklinks and snippets ship as built-in stores -- so zero new
packages, and `vicinae dmenu` replaces the planned compiled extension
outright. What was missing gets built: a power menu (lock, suspend, log
out through uwsm, restart, power off), reminders as transient systemd
timers with a pick-to-cancel list, a color picker over hyprpicker, and
dmenu pick-lists for window switching, force quit, kill process, SSH
hosts, and recent files -- all through one panama-pick helper. The
launcher commands contract exercises the reminder parsing and every
pick-list against stubs, including killing its own sacrificial sleep.

config/dot/quickshell/scripts/panama-pick

@@ -0,0 +1,103 @@
+#!/usr/bin/env bash
+
+# List-driven launcher commands, through `vicinae dmenu`.
+#
+#   panama-pick window        fuzzy-switch to an open window
+#   panama-pick quit-window   pick a window; SIGTERM it, SIGKILL on repeat
+#   panama-pick process       pick a process by CPU; SIGTERM it
+#   panama-pick ssh           pick a Host from ~/.ssh/config; open a session
+#   panama-pick recent        pick a recently used file; open it
+#
+# One helper rather than five scripts because every subcommand is the same
+# sentence: build a list, let dmenu pick a line, act on the index. dmenu is
+# vicinae's own list view, so these read as launcher commands without a
+# compiled extension behind them.
+
+set -uo pipefail
+
+# Prints the picked index for the lines on stdin, or nothing on Escape.
+menu() {
+  vicinae dmenu --navigation-title "$1" --section-title "$2" \
+    --format index --no-section 2>/dev/null
+}
+
+# Selected line (1-indexed by dmenu's 0-indexed output) from a saved list.
+line_at() {
+  sed -n "$(( $1 + 1 ))p"
+}
+
+case "${1:-}" in
+  window|quit-window)
+    clients="$(hyprctl clients -j | jq -r '
+      [.[] | select(.mapped and .workspace.id > 0)] | sort_by(.workspace.id)[]
+      | [.address, .pid, "\(.title)   (\(.class), workspace \(.workspace.id))"]
+      | @tsv')"
+    [[ -n "$clients" ]] || exit 0
+    title="Switch to window"; [[ "$1" == quit-window ]] && title="Force quit window"
+    idx="$(cut -f3 <<<"$clients" | menu "$title" 'Windows ({count})')" || exit 0
+    [[ -n "$idx" ]] || exit 0
+    picked="$(line_at "$idx" <<<"$clients")"
+    address="$(cut -f1 <<<"$picked")"
+    pid="$(cut -f2 <<<"$picked")"
+    if [[ "$1" == window ]]; then
+      exec hyprctl dispatch focuswindow "address:$address"
+    fi
+    # TERM first; the window still being mapped a moment later means the app
+    # ignored it, which is what force quit exists for.
+    kill "$pid" 2>/dev/null || true
+    sleep 1
+    if hyprctl clients -j | jq -e --arg a "$address" '.[] | select(.address == $a)' >/dev/null 2>&1; then
+      kill -9 "$pid" 2>/dev/null || true
+    fi
+    ;;
+  process)
+    procs="$(ps -eo pid=,pcpu=,comm= --sort=-pcpu | awk -v self=$$ '$1 != self { printf "%s\t%5.1f%%  %s\n", $1, $2, $3 }' | head -60)"
+    [[ -n "$procs" ]] || exit 0
+    idx="$(cut -f2 <<<"$procs" | menu "Kill process" 'By CPU ({count})')" || exit 0
+    [[ -n "$idx" ]] || exit 0
+    pid="$(line_at "$idx" <<<"$procs" | cut -f1)"
+    kill "$pid" 2>/dev/null \
+      && notify-send "Sent SIGTERM to $pid" 2>/dev/null || true
+    ;;
+  ssh)
+    config="$HOME/.ssh/config"
+    hosts="$( [[ -r "$config" ]] && awk '/^[Hh]ost / { for (i = 2; i <= NF; i++) if ($i !~ /[*?]/) print $i }' "$config" | sort -u )"
+    if [[ -z "$hosts" ]]; then
+      notify-send "SSH Hosts" "No hosts in ~/.ssh/config" 2>/dev/null || true
+      exit 0
+    fi
+    idx="$(menu "Open SSH session" 'Hosts ({count})' <<<"$hosts")" || exit 0
+    [[ -n "$idx" ]] || exit 0
+    host="$(line_at "$idx" <<<"$hosts")"
+    # kitty, matching hypr/keybinds.lua -- the terminal is written down in a
+    # few places and this one keeps the same value until one owner exists.
+    exec kitty --detach ssh "$host"
+    ;;
+  recent)
+    xbel="$HOME/.local/share/recently-used.xbel"
+    entries="$( [[ -r "$xbel" ]] && python3 - "$xbel" <<'PY'
+import sys, urllib.parse, xml.etree.ElementTree as ET
+try:
+    root = ET.parse(sys.argv[1]).getroot()
+except ET.ParseError:
+    sys.exit(0)
+marks = [(b.get("modified") or "", b.get("href") or "") for b in root.iter("bookmark")]
+for _, href in sorted(marks, reverse=True)[:40]:
+    if href.startswith("file://"):
+        path = urllib.parse.unquote(href[7:])
+        print(f"{path}")
+PY
+    )"
+    if [[ -z "$entries" ]]; then
+      notify-send "Recent Files" "Nothing recorded yet" 2>/dev/null || true
+      exit 0
+    fi
+    idx="$(sed "s|^$HOME|~|" <<<"$entries" | menu "Open recent file" 'Recent ({count})')" || exit 0
+    [[ -n "$idx" ]] || exit 0
+    exec xdg-open "$(line_at "$idx" <<<"$entries")"
+    ;;
+  *)
+    echo 'usage: panama-pick window|quit-window|process|ssh|recent' >&2
+    exit 2
+    ;;
+esac