Add theme-set/switching logic, and minor nvim, tmux, obsidian changes

ref/macos-system-settings.md

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+# macOS system settings
+
+settings for manual configuration in macOS system settings app
+
+**NOTE:** some of these could be scripted, but for now i'm okay with this manual list
+
+- desktop & dock
+    - `click wallpaper to reveal desktop`: set to "only in stage manager"
+    - all `drag windows to corner/edge/place` types of options: disabled
+    - `rearrange spaces based on recent use`: disabled
+    - `when switch to app... switch to space with open windows of app`: disabled
+    - `displays have separate spaces`: disabled
+    - `show files on desktop`: enabled
+    - `group windows by application`: enabled
+    - smallest possible dock size
+    - dock on right side of screen
+    - automatically hide and show the dock: enabled
+- accessibility
+    - display
+        - reduce motion: enabled
+        - reduce transparency: enabled
+
+and in general, just go through most pages/options and set them as desired
+