umbriel: scratchpad residents float as a centered 960px square instead of maximized

dot_config/umbriel/rules.toml

@@ -119,8 +119,7 @@ default_output = "Apple Computer Inc StudioDisplay 0x984262A7"
 match.title = "^Sticky Notes$"
 default_output = "Apple Computer Inc StudioDisplay 0x984262A7"
 
-# Scratchpad residents, last so they win over the placement rules above. Their
-# presentation (maximized) is animation.scratchpad in config.toml.
+# Scratchpad residents, last so they win over the placement rules above.
 [[window_rule]]
 match.app_id = "^so[.]stencil[.]tern$"
 default_scratchpad = "tern"
@@ -145,6 +144,21 @@ default_scratchpad = "home"
 match.app_id = "^ai[.]elementlabs[.]lmstudio$"
 default_scratchpad = "lmstudio"
 
+# Presentation shared by every scratchpad resident: a 960px square centered on
+# the output (fits the laptop panel's 1038px usable height), floating so it
+# never joins the strip. Last, so it overrides default_floating = false from
+# the translucent-apps rule for Claude and Beeper.
+[[window_rule]]
+match.app_id = [
+  "^so[.]stencil[.]tern$", "^com[.]anthropic[.]Claude$",
+  "^com[.-]fastmail[.-][Ff]astmail$", "^Beeper$",
+  "^brave-home[.]google[.]com__", "^ai[.]elementlabs[.]lmstudio$",
+]
+default_floating = true
+default_maximize = false
+default_floating_size_px = { width = 960, height = 960 }
+default_position = { x = 0, y = 0, anchor = "center" }
+
 # ==============================================================================
 # Layer rules