terra: cosmic portals, jupiter smb mount, tea CLI, launcher/theme polish

- swap gtk portal/apps for cosmic (xdg-desktop-portal-cosmic, cosmic-files,
  cosmic-settings) and drop dolphin/protonplus/bambu-studio (bambu-studio
  moved to flatpak alongside the other comms/gaming flatpaks)
- mount jupiter's samba share at /mnt/jupiter (automount, credentials from
  the same samba_password secret jupiter itself uses)
- add tea (gitea's remote API CLI) for talking to git.mgaction.town from
  terra without SSHing into jupiter
- new dark icon themes (Amy, Azure Glassy, Slot Beauty) vendored from
  gnome-look.org tarballs, packaged since pling download links expire
- rishot: fix Qt5Compat.GraphicalEffects QML import (was missing qt6.qt5compat
  on QML_IMPORT_PATH, so quickshell failed at config-load)
- launcher widgets: stop LauncherConsole/LauncherDock from reserving
  compositor space (ExclusionMode.Ignore, they're overlays not real docks);
  bump LauncherCorner app icon size 28->34
- comms script: launch telegram/discord via flatpak, not native binaries
- nix-ld + boot.binfmt aarch64 emulation (for building/flashing mercury
  from terra)

pkgs/rishot.nix

@@ -9,6 +9,7 @@
 , curl
 , kdePackages
 , libnotify
+, qt6
 }:
 
 # Wayland screenshot + annotation overlay, driven entirely by quickshell (qs -p
@@ -16,6 +17,11 @@
 # plus src/*.qml, no nixpkgs package exists. bin/rishot resolves its QML dir at
 # $self/../src by default, which breaks once wrapProgram rewrites argv0; setting
 # RISHOT_CONFIG_DIR sidesteps that self-lookup entirely (see bin/rishot upstream).
+#
+# Overlay.qml imports Qt5Compat.GraphicalEffects, which quickshell's own Qt
+# runtime doesn't ship — without qt5compat on the QML import path, `qs`
+# fails at config-load with "module Qt5Compat.GraphicalEffects is not
+# installed" and rishot exits 255 before ever drawing anything.
 stdenvNoCC.mkDerivation (finalAttrs: {
   pname = "rishot";
   version = "0-unstable-2026-07-10";
@@ -52,7 +58,9 @@ stdenvNoCC.mkDerivation (finalAttrs: {
         curl
         kdePackages.kdialog
         libnotify
-      ]}
+      ]} \
+      --prefix QML_IMPORT_PATH : "${qt6.qt5compat}/lib/qt-6/qml" \
+      --prefix QML2_IMPORT_PATH : "${qt6.qt5compat}/lib/qt-6/qml"
 
     runHook postInstall
   '';