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/JOURNAL.md

@@ -19,6 +19,20 @@ Template:
 
 ---
 
+## 2026-07-15 — Fix batch #123–#126 (install bake, flake ref, ISO name, display)
+- **Task:** Fix-only NOW batch: #123 dconf pre-activate, #124 main flake
+  seed, #125 ISO filename, #126 display mode list.
+- **Did:** (123) pre-activate creates `/run/user/$UID` + prefers
+  `dbus-run-session -- activate`. (124) seed `?ref=main`; patch-template
+  rewrites `inputs.nomarchy.url` from NOMARCHY_FLAKE_URL (was unused);
+  template default main. (125) `image.baseName` → nomarchy-live-….iso.
+  (126) sort modes by pixel area; toast shows hyprctl size; TESTING QEMU note.
+- **Verified:** V0 flake check; installer-safety; `image.baseName` eval
+  `nomarchy-live-…`; patch-template flakeUrl rewrite; mode sort unit fixture.
+- **Pending:** V3 reinstall on Acer/XPS (#123/#124); optional full
+  `test-install.sh` V2 when time allows.
+- **Next suggestion:** #112 disk-picker fd0, or V2 test-install for #123.
+
 ## 2026-07-15 — File #125 ISO name + #126 display resolution invert (no code)
 - **Task:** Bernardo: (1) installer ISO still named nixos; (2) live VM
   Display picker — higher modes made the screen look lower-res.