feat(cli): new layout-ratios command

The implementation adds a new layout-ratio CLI command to komorebi that
allows users to dynamically set column and row ratios for layouts at
runtime via komorebic layout-ratio --columns 0.3 0.4 --rows 0.5.

A public validate_ratios function was added to komorebi-layouts that
clamps ratio values between 0.1 and 0.9, truncates when the cumulative
sum would reach or exceed 1.0, and limits to a maximum of 5 ratios. This
function is shared between config file deserialization and the new CLI
command, ensuring consistent validation behavior.

The SocketMessage enum in komorebi/src/core/mod.rs has a new
LayoutRatios variant. The handler in process_command.rs uses the shared
validate_ratios function to process the ratios before applying them to
the focused workspace's layout options.

When the CLI command is called without any arguments, it prints a
helpful message instead of returning an error.

schema.bar.json

@@ -5417,6 +5417,46 @@
             "content"
           ]
         },
+        {
+          "type": "object",
+          "properties": {
+            "content": {
+              "type": "array",
+              "maxItems": 2,
+              "minItems": 2,
+              "prefixItems": [
+                {
+                  "type": [
+                    "array",
+                    "null"
+                  ],
+                  "items": {
+                    "type": "number",
+                    "format": "float"
+                  }
+                },
+                {
+                  "type": [
+                    "array",
+                    "null"
+                  ],
+                  "items": {
+                    "type": "number",
+                    "format": "float"
+                  }
+                }
+              ]
+            },
+            "type": {
+              "type": "string",
+              "const": "LayoutRatios"
+            }
+          },
+          "required": [
+            "type",
+            "content"
+          ]
+        },
         {
           "type": "object",
           "properties": {