base: Super+Ctrl+T toggles one persistent btop

Omarchy's Activity binding launches a fresh btop each time, so its graph
history is gone on every open. base now starts a single btop at login on
special:activity and binds Super+Ctrl+T to show/hide it; if btop is quit,
the next toggle re-seeds it. Ships as hypr/layers/10-base.lua so every
profile, including the Coder desktops, gets it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -56,7 +56,7 @@ and shared layers beneath it. `./install.sh --show` prints the result.
 
 | Layer | Used by | What |
 |---|---|---|
-| `base` | all | `hyprland.lua` with the `hypr/layers/` loader; `bindings.lua` kept at stock |
+| `base` | all | `hyprland.lua` with the `hypr/layers/` loader; `bindings.lua` kept at stock; Super+Ctrl+T toggles one persistent btop |
 | `personal` | both laptops | branding, default agent (`claude`), herdr, opencode, voxtype |
 | `personal-desktop` | HP | the three hand-built themes, the shell plugins, bar layout, Claude/Herdr bindings |
 | `features/handoff` | both laptops | `omarchy-handoff` + patched lan-mouse, its unit and binding |
@@ -66,7 +66,7 @@ and shared layers beneath it. `./install.sh --show` prints the result.
 **Hyprland settings never share a file.** `base`'s `hyprland.lua` loads every
 `~/.config/hypr/layers/*.lua` in name order (Omarchy's own `require_all`, with
 reload), after `monitors`/`input`/`bindings`/`looknfeel`/`autostart`. Each
-layer ships its own `NN-<layer>.lua` there — roles 20s, `personal-desktop` 40,
+layer ships its own `NN-<layer>.lua` there — `base` 10, roles 20s, `personal-desktop` 40,
 features 50, machines 80 — and `bindings.lua` stays stock so nothing is bound
 twice. `install.sh` warns about a file in `hypr/layers/` that no layer of the
 current profile provides (a role you dropped).