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

config/dot/quickshell/services/SettingsSearch.qml

@@ -136,6 +136,8 @@ Singleton {
         { label: "Desktop version", detail: "Which Hyprland and Quickshell this session runs", page: "about" },
         { label: "Restore defaults", detail: "Return every Panama setting to its shipped value", page: "desktop" },
         { label: "Keyboard shortcuts", detail: "Every shortcut the compositor has bound", page: "shortcuts" },
+        { label: "Dictation", detail: "Speech to text with Super+D, typed where the cursor is", page: "dictation" },
+        { label: "Speech to text", detail: "Set up the local speech server and model", page: "dictation" },
         { label: "System Health", detail: "Check Panama services, integrations, tools, and recovery actions", page: "services" },
         { label: "Copy health report", detail: "Copy a redacted Panama doctor report", page: "services" },
         { label: "Lock screen background", detail: "Choose a blurred desktop, wallpaper, or solid color", page: "appearance" },