feat: Claude Code CLI v2.1.105–v2.1.131 support (#274)

## Overview

Full audit and implementation of Claude Code CLI changelog entries from v2.1.105 through v2.1.131.

## Changes

### Implemented

- **#268** — Add `claude-opus-4-7` to the model picker, update all model pricing and context window sizes (also fixes a bug where `claude-opus-4-6` was coded as 200K context instead of 1M)
- **#269** — Expose effort level setting in UI via `--effort <level>` flag (`low`, `medium`, `high`, `xhigh`, `max`)
- **#273** — Expose prompt caching TTL env vars in UI (`ENABLE_PROMPT_CACHING_1H` / `FORCE_PROMPT_CACHING_5M`)
- **#267** — Add `PreCompact` hook support — emits `claude:pre-compact` event with "Compacting context..." toast and thinking state
- **#270** — Parse `plugin_errors` from stream-json init event and surface them as error output lines
- **#266** — Bump supported CLI version constant to `2.1.131`

### Closed as Not Applicable

- **#271** (`autoScrollEnabled`) — TUI-only setting; we manage our own scroll behaviour
- **#272** (`tui` fullscreen mode) — TUI-only setting; we use stream-json and never activate the TUI

## Testing

All checks pass (`./check-all.sh`) including frontend lint, format, type check, Vitest coverage, Clippy, and Rust test coverage.

✨ This PR was created with help from Hikari~ 🌸

Reviewed-on: #274
Co-authored-by: Hikari <hikari@nhcarrigan.com>
Co-committed-by: Hikari <hikari@nhcarrigan.com>

src-tauri/src/wsl_bridge.rs

@@ -17,7 +17,7 @@ use crate::types::{
     AgentEndEvent, AgentStartEvent, CharacterState, ClaudeMessage, ConnectionEvent,
     ConnectionStatus, ContentBlock, CwdChangedEvent, ElicitationEvent, ElicitationResultEvent,
     FileChangedEvent, MessageCost, OutputEvent, PermissionDeniedEvent, PermissionPromptEvent,
-    PermissionPromptEventItem, PostCompactEvent, QuestionOption, SessionEvent, StateChangeEvent,
+    PermissionPromptEventItem, PostCompactEvent, PreCompactEvent, QuestionOption, SessionEvent, StateChangeEvent,
     StopFailureEvent, TaskCreatedEvent, TodoItem, TodoUpdateEvent, UserQuestionEvent,
     WorkingDirectoryEvent, WorktreeEvent, WorktreeInfo,
 };
@@ -308,6 +308,14 @@ impl WslBridge {
                 cmd.arg("--bare");
             }
 
+            // Add effort level if specified (v2.1.111+)
+            if let Some(ref level) = options.effort_level {
+                if !level.is_empty() {
+                    cmd.arg("--effort");
+                    cmd.arg(level);
+                }
+            }
+
             // Pass combined settings via --settings flag if any settings are specified
             {
                 let has_memory_dir = options
@@ -402,6 +410,15 @@ impl WslBridge {
                 }
             }
 
+            // Set prompt caching TTL env var if specified (v2.1.108+)
+            if let Some(ref ttl) = options.prompt_caching_ttl {
+                match ttl.as_str() {
+                    "1h" => { cmd.env("ENABLE_PROMPT_CACHING_1H", "1"); }
+                    "5m" => { cmd.env("FORCE_PROMPT_CACHING_5M", "1"); }
+                    _ => {}
+                }
+            }
+
             cmd
         } else {
             // Running on Windows - use wsl with bash login shell to ensure PATH is loaded
@@ -477,6 +494,15 @@ impl WslBridge {
                 }
             }
 
+            // Set prompt caching TTL env var if specified (v2.1.108+)
+            if let Some(ref ttl) = options.prompt_caching_ttl {
+                match ttl.as_str() {
+                    "1h" => { claude_cmd.push_str("ENABLE_PROMPT_CACHING_1H=1 "); }
+                    "5m" => { claude_cmd.push_str("FORCE_PROMPT_CACHING_5M=1 "); }
+                    _ => {}
+                }
+            }
+
             claude_cmd.push_str(
                 "claude --output-format stream-json --input-format stream-json --verbose",
             );
@@ -532,6 +558,13 @@ impl WslBridge {
                 claude_cmd.push_str(" --bare");
             }
 
+            // Add effort level if specified (v2.1.111+)
+            if let Some(ref level) = options.effort_level {
+                if !level.is_empty() {
+                    claude_cmd.push_str(&format!(" --effort {}", level));
+                }
+            }
+
             // Pass combined settings via --settings flag if any settings are specified
             {
                 let has_memory_dir = options
@@ -887,10 +920,9 @@ impl WslBridge {
             let stats = self.stats.read();
             for tool_name in &tools {
                 if let Some(tool_stats) = stats.session_tools_usage.get(tool_name) {
-                    if tool_stats.call_count > 0 {
-                        // Use session average tokens per call for this tool
-                        let avg_tokens = (tool_stats.estimated_input_tokens + tool_stats.estimated_output_tokens)
-                            / tool_stats.call_count;
+                    if let Some(avg_tokens) = (tool_stats.estimated_input_tokens + tool_stats.estimated_output_tokens)
+                        .checked_div(tool_stats.call_count)
+                    {
                         tool_overhead_tokens += avg_tokens;
                         tracing::info!("[COST ESTIMATION] Tool {} average: {} tokens", tool_name, avg_tokens);
                     }
@@ -1140,6 +1172,7 @@ fn handle_stderr(
                 let is_elicitation = line.contains("[Elicitation Hook]");
                 let is_elicitation_result = line.contains("[ElicitationResult Hook]");
                 let is_stop_failure = line.contains("[StopFailure Hook]");
+                let is_pre_compact = line.contains("[PreCompact Hook]");
                 let is_post_compact = line.contains("[PostCompact Hook]");
                 let is_cwd_changed = line.contains("[CwdChanged Hook]");
                 let is_file_changed = line.contains("[FileChanged Hook]");
@@ -1154,7 +1187,7 @@ fn handle_stderr(
                     "elicitation"
                 } else if is_stop_failure {
                     "error"
-                } else if is_post_compact {
+                } else if is_pre_compact || is_post_compact {
                     "compact-prompt"
                 } else if is_cwd_changed {
                     "cwd-changed"
@@ -1280,6 +1313,28 @@ fn handle_stderr(
                             parent_tool_use_id: None,
                         },
                     );
+                } else if is_pre_compact {
+                    let data = parse_pre_compact_hook(&line);
+
+                    let _ = app.emit(
+                        "claude:pre-compact",
+                        PreCompactEvent {
+                            session_id: data.session_id,
+                            conversation_id: conversation_id.clone(),
+                        },
+                    );
+
+                    let _ = app.emit(
+                        "claude:output",
+                        OutputEvent {
+                            line_type: "compact-prompt".to_string(),
+                            content: "Compacting context — conversation history is being summarised to free up space.".to_string(),
+                            tool_name: None,
+                            conversation_id: conversation_id.clone(),
+                            cost: None,
+                            parent_tool_use_id: None,
+                        },
+                    );
                 } else if is_post_compact {
                     let data = parse_post_compact_hook(&line);
 
@@ -1623,6 +1678,16 @@ fn build_stop_failure_message(data: &StopFailureData) -> String {
     }
 }
 
+#[derive(Debug)]
+struct PreCompactData {
+    session_id: Option<String>,
+}
+
+fn parse_pre_compact_hook(line: &str) -> PreCompactData {
+    let session_id = extract_debug_string_value(line, "session_id");
+    PreCompactData { session_id }
+}
+
 #[derive(Debug)]
 struct PostCompactData {
     session_id: Option<String>,
@@ -1784,6 +1849,7 @@ fn process_json_line(
             subtype,
             session_id,
             cwd,
+            plugin_errors,
             ..
         } => {
             if subtype == "init" {
@@ -1808,6 +1874,31 @@ fn process_json_line(
                         },
                     );
                 }
+
+                // Warn about any plugins that failed to load (v2.1.111+)
+                if let Some(errors) = plugin_errors {
+                    if let Some(arr) = errors.as_array() {
+                        for error in arr {
+                            let msg = if let Some(s) = error.as_str() {
+                                s.to_string()
+                            } else {
+                                error.to_string()
+                            };
+                            let _ = app.emit(
+                                "claude:output",
+                                OutputEvent {
+                                    line_type: "error".to_string(),
+                                    content: format!("Plugin error: {}", msg),
+                                    tool_name: None,
+                                    conversation_id: conversation_id.clone(),
+                                    cost: None,
+                                    parent_tool_use_id: None,
+                                },
+                            );
+                        }
+                    }
+                }
+
                 emit_state_change(app, CharacterState::Idle, None, conversation_id.clone());
             }
         }
@@ -3887,6 +3978,28 @@ mod tests {
         assert_eq!(data.session_id, None);
     }
 
+    #[test]
+    fn test_parse_pre_compact_hook_with_session_id() {
+        let line =
+            r#"[PreCompact Hook] session_id=Some("sess-abc123"), conversation_id=Some("conv-xyz")"#;
+        let data = parse_pre_compact_hook(line);
+        assert_eq!(data.session_id, Some("sess-abc123".to_string()));
+    }
+
+    #[test]
+    fn test_parse_pre_compact_hook_without_session_id() {
+        let line = "[PreCompact Hook] session_id=None";
+        let data = parse_pre_compact_hook(line);
+        assert_eq!(data.session_id, None);
+    }
+
+    #[test]
+    fn test_parse_pre_compact_hook_empty_line() {
+        let line = "[PreCompact Hook]";
+        let data = parse_pre_compact_hook(line);
+        assert_eq!(data.session_id, None);
+    }
+
     #[test]
     fn test_parse_cwd_changed_hook_with_cwd_key() {
         let line = r#"[CwdChanged Hook] cwd="/home/naomi/code/my-project""#;