feat: Add Zsh shell completion support for the toak command and integrate its installation.

_toak

@@ -0,0 +1,56 @@
+#compdef toak
+
+_toak() {
+    local line
+    local -a commands
+    local -a global_options
+
+    global_options=(
+        '(-v --verbose)'{-v,--verbose}'[Enable detailed debug logging]'
+        '(-h --help)'{-h,--help}'[Show help message]'
+        '--version[Show version information]'
+    )
+
+    commands=(
+        'toggle:Starts or stops the recording'
+        'discard:Abort current recording without transcribing'
+        'onboard:Configure the application'
+        'latency-test:Benchmark full pipeline without recording'
+        'show:Show current configuration'
+        'config:Update a specific configuration setting'
+    )
+
+    _arguments -C \
+        $global_options \
+        '1: :->cmds' \
+        '*:: :->args'
+
+    case $state in
+        cmds)
+            _describe -t commands 'command' commands
+            ;;
+        args)
+            case $words[1] in
+                toggle)
+                    _arguments \
+                        '(-p --pipe)'{-p,--pipe}'[Output transcription to stdout instead of typing]' \
+                        '--copy[Copy to clipboard instead of typing]'
+                    ;;
+                discard)
+                    _arguments \
+                        '(-p --pipe)'{-p,--pipe}'[Output transcription to stdout instead of typing]'
+                    ;;
+                config)
+                    _arguments \
+                        '1:key:(llm whisper language lang backend punctuation tech)' \
+                        '2:value:'
+                    ;;
+                *)
+                    _message "no more arguments"
+                    ;;
+            esac
+            ;;
+    esac
+}
+
+_toak "$@"