Fold thirty-one settings pages into fifteen categories with tabs

The sidebar was a flat scan of thirty-one rows; now it reads like a
settings app. Multi-subject categories (Input, Network & Sharing,
Applications, Users & Accounts, Privacy & Security, System) carry an
Appearance-style tab strip above the page, drawn by the shell so the
leaf pages themselves are untouched. The taxonomy lives in one new
file, services/SettingsRoutes.qml; the sidebar, the strip, route
validation, search breadcrumbs, and both generators derive from it.

ShellState.settingsPage still holds leaf ids, so every deep link, IPC
call, and search result keeps working — and now lands on the exact
tab. Dictation moves out of Sound onto its own page under Input, with
a handoff back to Sound for the microphone. The strip scrolls when
System's nine tabs outgrow a tiled window. All 161 contracts pass.

Claude-Session: https://claude.ai/code/session_01Ms2FbjQy31TVf3CEvQhGM8

tests/quickshell/settings-pages-contract

@@ -9,7 +9,7 @@ fail() {
     exit 1
 }
 
-pages=(Home Displays Connectivity Sound Notifications ScreenIntelligence Health About)
+pages=(Home Displays Connectivity Sound Dictation Notifications ScreenIntelligence Health About)
 for page in "${pages[@]}"; do
     page_file="$repo_dir/config/dot/quickshell/modules/settings/${page}Page.qml"
     [[ -f "$page_file" ]] || fail "${page}Page.qml is missing"
@@ -303,7 +303,11 @@ qs_for_test ipc call home-assistant fixture ready >/dev/null
 shell_pid="$harness_pid"
 [[ "$shell_pid" =~ ^[0-9]+$ ]] || fail 'could not identify the branch shell process'
 
-pages=(home appearance displays connectivity home-phone desktop sound notifications screen-intelligence shortcuts services about)
+# A spread of leaves rather than all of them: tabless categories, tabs from
+# four different categories, and the page the tab strip was introduced for.
+# Routing to a tab must land on that tab, not on whatever its category opens
+# first, which is the failure the SettingsRoutes resolution could introduce.
+pages=(home appearance displays connectivity home-phone desktop sound dictation notifications screen-intelligence shortcuts services manual about)
 for page in "${pages[@]}"; do
     qs_for_test ipc call settings page "$page" >/dev/null
     for _ in $(seq 1 20); do