Spawn shell subprocesses with bash -c instead of bash -lc

Each `bash -lc` starts a login shell that re-sources the profile
(mise activation, /etc/profile.d) on every invocation — ~16 forks per
call versus ~2 for `bash -c` — which taxes every menu/panel/launcher
action the shell shells out for. The session already exports PATH and
env to the shell, so omarchy commands resolve fine under `bash -c`.

Switch the internal/omarchy-owned spawns (theme+background switches,
brightness, monitor scaling, DNS, lock/fingerprint, keyboard-layout
probe, voxtype status, and the `:`/printf state-file writes) to
`bash -c`. Leave `bash -lc` on the sites that run user-configurable
commands (custom bar-widget exec, menu provider/guard scripts,
launcher scan commands, configurable idle/screensaver command), where
a user's command may rely on their login environment.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

shell/plugins/lock/Service.qml

@@ -352,7 +352,7 @@ Item {
 
   Process {
     id: fingerprintCheckProc
-    command: ["bash", "-lc", "if [[ -f /etc/pam.d/omarchy-lock-fingerprint ]] && command -v fprintd-list >/dev/null 2>&1 && fprintd-list \"$USER\" 2>/dev/null | grep -qi finger; then echo yes; else echo no; fi"]
+    command: ["bash", "-c", "if [[ -f /etc/pam.d/omarchy-lock-fingerprint ]] && command -v fprintd-list >/dev/null 2>&1 && fprintd-list \"$USER\" 2>/dev/null | grep -qi finger; then echo yes; else echo no; fi"]
     stdout: StdioCollector { id: fingerprintCheckStdout; waitForEnd: true }
     onExited: {
       root.fingerprintConfigured = String(fingerprintCheckStdout.text || "").trim() === "yes"
@@ -363,12 +363,12 @@ Item {
 
   Process {
     id: wakeProcess
-    command: ["bash", "-lc", "omarchy-system-wake"]
+    command: ["bash", "-c", "omarchy-system-wake"]
   }
 
   Process {
     id: blankProcess
-    command: ["bash", "-lc", "omarchy-brightness-keyboard off; omarchy-brightness-display off"]
+    command: ["bash", "-c", "omarchy-brightness-keyboard off; omarchy-brightness-display off"]
   }
 
   Timer {