Fix tool results visibility, dynamic system prompt, rebrand Galaxy AI to Galaxy

- Rewrite extract_system_prompt to dynamically include CWD, OS, shell, git,
  project rules, and tool usage guidance from request context
- Fix extract_tool_result_content and format_tool_call_result to properly
  handle Grep, FileGlobV2, and ApplyFileDiffs results (were returning empty
  'Tool completed successfully' strings - model never saw file lists)
- Rename all 'Galaxy AI' references to just 'Galaxy' (menu, window title,
  bundle names, plist, welcome text, about)
- Update smoke test with file visibility test prompt
- Suppress dead_code warnings on unused smoke test functions

app/src/ai_assistant/mod.rs

@@ -1,4 +1,4 @@
-//! AI Assistant has since been renamed to "Galaxy AI" in the product.
+//! AI Assistant has since been renamed to "Galaxy" in the product.
 use std::{collections::HashSet, sync::Arc};
 
 use crate::{
@@ -34,8 +34,8 @@ mod test_util;
 /// This is also roughly the limit at which the editor starts degrading.
 pub const PROMPT_CHARACTER_LIMIT: usize = 1000;
 
-pub const AI_ASSISTANT_FEATURE_NAME: &str = "Galaxy AI";
-pub const ASK_AI_ASSISTANT_TEXT: &str = "Ask Galaxy AI";
+pub const AI_ASSISTANT_FEATURE_NAME: &str = "Galaxy";
+pub const ASK_AI_ASSISTANT_TEXT: &str = "Ask Galaxy";
 
 pub const AI_ASSISTANT_SVG_PATH: &str = "bundled/svg/ai-assistant.svg";
 

app/src/ai_assistant/panel.rs

@@ -165,14 +165,14 @@ pub fn init(app: &mut AppContext) {
         .with_key_binding(cmd_or_ctrl_shift("l")),
         EditableBinding::new(
             "ai_assistant_panel:reset_context",
-            "Restart Galaxy AI",
+            "Restart Galaxy",
             AIAssistantAction::ResetContext,
         )
         .with_context_predicate(id!("AIAssistantPanel"))
         .with_key_binding("ctrl-l"),
         EditableBinding::new(
             "ai_assistant_panel:reset_context",
-            "Restart Galaxy AI",
+            "Restart Galaxy",
             AIAssistantAction::ResetContext,
         )
         .with_context_predicate(id!("AIAssistantPanel"))