feat: multiple UI improvements, font settings, and memory file display names (#175)

## Summary

- **fix**: `show_thinking_blocks` setting now persists across sessions — it was defined on the TypeScript side but missing from the Rust `HikariConfig` struct, so serde silently dropped it on every save/load
- **feat**: Tool calls are now rendered as collapsible blocks matching the Extended Thinking block aesthetic, replacing the old inline dropdown approach
- **feat**: Add configurable max output tokens setting
- **feat**: Use random creative names for conversation tabs
- **test**: Significantly expanded frontend unit test coverage
- **docs**: Require tests for all changes in CLAUDE.md
- **feat**: Allow users to specify a custom terminal font (Closes #176)
- **feat**: Display friendly names for memory files derived from the first heading (Closes #177)
- **feat**: Add custom UI font support for the app chrome (buttons, labels, tabs)
- **fix**: Apply custom UI font to the full app interface — `.app-container` was hardcoded, blocking inheritance from `body`; also renamed "Custom Font" to "Custom Terminal Font" for clarity

✨ This PR was created with help from Hikari~ 🌸

Reviewed-on: #175
Co-authored-by: Hikari <hikari@nhcarrigan.com>
Co-committed-by: Hikari <hikari@nhcarrigan.com>

src-tauri/src/wsl_bridge.rs

@@ -296,6 +296,11 @@ impl WslBridge {
                 cmd.env("CLAUDE_CODE_DISABLE_1M_CONTEXT", "1");
             }
 
+            // Set max output tokens if specified
+            if let Some(max_tokens) = options.max_output_tokens {
+                cmd.env("CLAUDE_CODE_MAX_OUTPUT_TOKENS", max_tokens.to_string());
+            }
+
             cmd
         } else {
             // Running on Windows - use wsl with bash login shell to ensure PATH is loaded
@@ -343,6 +348,11 @@ impl WslBridge {
                 claude_cmd.push_str("CLAUDE_CODE_DISABLE_1M_CONTEXT=1 ");
             }
 
+            // Set max output tokens if specified
+            if let Some(max_tokens) = options.max_output_tokens {
+                claude_cmd.push_str(&format!("CLAUDE_CODE_MAX_OUTPUT_TOKENS={} ", max_tokens));
+            }
+
             claude_cmd.push_str(
                 "claude --output-format stream-json --input-format stream-json --verbose",
             );