fix(install): bake dconf, seed main, name ISO, display modes (#123–#126)

Batch of existing-bug fixes from Acer/XPS install findings:

- #123: HM pre-activate creates /run/user/$UID and prefers
  dbus-run-session so dconf no longer aborts the desktop bake
- #124: main-built ISOs seed ?ref=main; patch-template rewrites
  inputs.nomarchy.url from NOMARCHY_FLAKE_URL (was set but unused)
- #125: image.baseName → nomarchy-live-….iso (not nixos-live-…)
- #126: Display mode list sorted by pixel area; toast shows hyprctl
  size; TESTING notes QEMU fixed-window scaling illusion

Verified: V0 flake check, installer-safety, baseName eval, patch-template
flakeUrl rewrite, mode-sort fixture.

agent/HARDWARE-QUEUE.md

@@ -427,24 +427,18 @@ the **T14s** (webcam case).
       template installs). Firefox is deliberately absent; its absence is
       correct, not a miss.
 - [ ] **#123 install bake: first boot fully themed without manual HM switch**
-      — after a fix for the dconf / XDG_RUNTIME_DIR abort lands, re-install
-      (or re-run bake) on **either** the Acer M5-481T or the Dell XPS 9350.
-      **Pass:** install ends with "Desktop pre-activated", no
-      `dconf-CRITICAL` / `Permission denied` in
+      — re-install from a main ISO (this commit+) on **either** the Acer
+      M5-481T or the Dell XPS 9350. **Pass:** install ends with "Desktop
+      pre-activated", no `dconf-CRITICAL` in
       `/var/log/nomarchy-hm-preactivate.log`, first graphical login has
-      coherent Stylix GTK theming **and** nm-applet in the Waybar tray
-      **without** running `home-manager switch` by hand. **Fail** = still
-      need the recovery one-liner, or GTK/nm-applet still wrong until a
-      manual switch (then the bake is still incomplete).
+      Stylix GTK + nm-applet **without** hand `home-manager switch`.
 - [ ] **#95 Kitty-only terminal on Acer M5-481T** — after rebuild/install
       from main: SUPER+Return opens **themed Kitty**; System › Doctor opens
       a floating classed Kitty window. No Ghostty on PATH required.
-- [ ] **#124 flake pin after main-ISO install** — on a machine installed
-      from a **main-built** ISO (post-fix): `~/.nomarchy/flake.nix`
-      nomarchy input must not re-resolve to a lagging `v1` that lacks
-      options the installer wrote. **Pass:** `nomarchy-rebuild` (and a
-      deliberate pull policy as documented by the fix) does **not** die
-      with `The option 'nomarchy.hardware' does not exist`.
+- [ ] **#124 flake pin after main-ISO install** — installed machine’s
+      `~/.nomarchy/flake.nix` has `?ref=main` (not lagging v1). **Pass:**
+      `nomarchy-rebuild` does not die with
+      `The option 'nomarchy.hardware' does not exist`.
 
 ## AMD dev box only
 - [ ] **#118 smartd still runs where drives DO have SMART** (this commit) — the