fix(ui): #139 sheets size themselves; #141 waybar clicks stop reading the env

#139 — calcurse/doctor floated full-screen. Two faults stacked, which is
why it looked like the float rules were dead:
  1. Hyprland 0.55.4 silently ignores percentage `size` rules. Matrix on
     hardware (both orders, kitty memory off): `size 60% 65%` never
     applies, `size 1536 936` applies either way, configerrors empty both
     times. Rule order was a red herring.
  2. Kitty defaults to remember_window_size=yes and replays the last OS
     window's size into every float — so after a tiled terminal, a sheet
     opens maximized. This is the Ghostty regression: Ghostty had no such
     memory, so fault 1 stayed invisible until #95.

Fix: remember_window_size=no (floats must be deterministic) and the sheets
ask for their own size — term-sheet.nix reads the focused monitor and
hands kitty the px, because px in a rule cannot mean "a fraction of *this*
screen" and one pair cannot serve 2560x1440 and the 1366x768 Acer (#131).
Those windows keep float/center and deliberately carry no size rule.

#141 — the updates click did nothing: whole-swaps hand-wrote
`sh -c '$TERMINAL …'` and Waybar has no TERMINAL (home.sessionVariables →
login shells only; the bar is spawned by Hyprland). Fixed at the root:
`nomarchy-updates upgrade-window` opens its own window, so all five call
sites name one env-free command and a theme file stops having an opinion
about terminals. checks.waybar-swap-env guards the class.

Bernardo asked mid-task for the update window to float — it is now the
third caller of the sheet helper (com.nomarchy.updates, 45%x50%).

V3 on the dev box: calendar 1536x936, doctor 1408x1008, updates 1152x720
— exactly the intended fractions, floating and centred; #141 driven under
`env -i` with no TERMINAL, matching Waybar's real environment; the guard
proven by reintroducing the bug. Acer V3 queued.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

modules/home/term-sheet.nix

@@ -0,0 +1,52 @@
+# Shared launcher for the floating terminal sheets (#139). Used by waybar.nix
+# (nomarchy-calendar) and rofi.nix (the doctor sheet) — the classed Kitty
+# windows hyprland.nix floats and centers.
+#
+# Why the size lives here and not in a window rule: Hyprland 0.55.4 silently
+# ignores a *percentage* `size` rule.  Measured on hardware 2026-07-16, both
+# rule orders, Kitty's own memory disabled so nothing could mask it:
+# `size 60% 65%` → the window keeps its requested size (no rule applied);
+# `size 1536 936` → lands exactly, in either order.  No `hyprctl configerrors`
+# either way, which is how it survived the post-0.53 rule rewrite unnoticed.
+#
+# Absolute px is not a fix: "a fraction of the screen" is the whole intent, and
+# one px pair cannot serve a 2560x1440 desk monitor and the 1366x768 Acer that
+# is live QA (#131).  A rule cannot compute it — the monitor is unknown at
+# eval time — so the sheet asks for its own size instead: read the focused
+# monitor here, hand Kitty the px, and let it request them.  Those windows
+# therefore carry float/center rules and deliberately no `size` rule.
+{ pkgs }:
+
+pkgs.writeShellScriptBin "nomarchy-term-sheet" ''
+  set -u
+  # usage: nomarchy-term-sheet <class> <width%> <height%> <cmd> [args...]
+  [ "$#" -ge 4 ] || { echo "usage: nomarchy-term-sheet <class> <w%> <h%> <cmd> [args...]" >&2; exit 64; }
+  cls="$1"; wpct="$2"; hpct="$3"; shift 3
+
+  # Hyprland reports the monitor in physical px plus the scale it renders at;
+  # Kitty sizes in logical px, so divide before taking the fraction.  A sheet
+  # that opens at a clumsy size still beats no sheet, so every failure here
+  # falls back rather than exits: no compositor (a TTY run), no jq answer, or
+  # a nonsense answer all land on a size that fits the smallest panel we ship
+  # on.
+  dims=$(hyprctl monitors -j 2>/dev/null \
+    | ${pkgs.jq}/bin/jq -r --argjson w "$wpct" --argjson h "$hpct" '
+        [ .[] | select(.focused) ][0]
+        | select(. != null)
+        | (.scale // 1) as $s
+        | select($s > 0)
+        | "\((.width  / $s * $w / 100) | floor) \((.height / $s * $h / 100) | floor)"' 2>/dev/null) || dims=
+  width=''${dims%% *}
+  height=''${dims##* }
+  case "$width$height" in
+    *[!0-9]*|"") width=800; height=500 ;;
+  esac
+  [ "$width"  -ge 320 ] 2>/dev/null || width=800
+  [ "$height" -ge 240 ] 2>/dev/null || height=500
+
+  exec ${pkgs.kitty}/bin/kitty \
+    -o remember_window_size=no \
+    -o initial_window_width="$width" \
+    -o initial_window_height="$height" \
+    --class="$cls" -e "$@"
+''