feat: another wave of features (#61)

## Explanation

This PR bundles several user-facing improvements and feature additions for the v0.3.0 release, including quality-of-life improvements to the UI, new slash commands, better state persistence, and auto-update checking.

## Included Changes

- **Resizable chat input** with drag handle (#58 partial)
- **Arrow key navigation fix** - cursor keys now navigate text when user has typed input (#58)
- **Scroll position persistence** per conversation tab
- **/skill command** for invoking Claude Code skills (#57)
- **Stats persistence fix** - stats now persist across session changes, only reset on disconnect (#59)
- **Auto-update checker** on startup (#17)
- **Resizable character panel** with full-height sprites (#10)
- **Font size and zoom settings** with keyboard shortcuts (Ctrl++/Ctrl+-/Ctrl+0) (#19)

## Closes

Closes #10, #17, #19, #57, #58, #59

## Attestations

- [x] I have read and agree to the Code of Conduct
- [x] I have read and agree to the Community Guidelines
- [x] My contribution complies with the Contributor Covenant
- [x] I have run the linter and resolved any errors
- [x] My pull request uses an appropriate title, matching the conventional commit standards
- [x] My scope of feat/fix/chore/etc. correctly matches the nature of changes in my pull request
- [x] All new and existing tests pass locally with my changes
- [x] Code coverage remains at or above the configured threshold

## Documentation

N/A - Internal app features

## Versioning

Minor - My pull request introduces new non-breaking features.

---
✨ This PR was created with help from Hikari~ 🌸

Co-authored-by: Hikari <hikari@nhcarrigan.com>
Reviewed-on: #61
Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-committed-by: Naomi Carrigan <commits@nhcarrigan.com>

src-tauri/src/commands.rs

@@ -1,10 +1,11 @@
 use tauri::{AppHandle, State};
+use tauri_plugin_http::reqwest;
 use tauri_plugin_store::StoreExt;
 
+use crate::achievements::{get_achievement_info, load_achievements, AchievementUnlockedEvent};
+use crate::bridge_manager::SharedBridgeManager;
 use crate::config::{ClaudeStartOptions, HikariConfig};
 use crate::stats::UsageStats;
-use crate::bridge_manager::SharedBridgeManager;
-use crate::achievements::{load_achievements, get_achievement_info, AchievementUnlockedEvent};
 
 const CONFIG_STORE_KEY: &str = "config";
 
@@ -71,23 +72,17 @@ pub async fn select_wsl_directory() -> Result<String, String> {
 
 #[tauri::command]
 pub async fn get_config(app: AppHandle) -> Result<HikariConfig, String> {
-    let store = app
-        .store("hikari-config.json")
-        .map_err(|e| e.to_string())?;
+    let store = app.store("hikari-config.json").map_err(|e| e.to_string())?;
 
     match store.get(CONFIG_STORE_KEY) {
-        Some(value) => {
-            serde_json::from_value(value.clone()).map_err(|e| e.to_string())
-        }
+        Some(value) => serde_json::from_value(value.clone()).map_err(|e| e.to_string()),
         None => Ok(HikariConfig::default()),
     }
 }
 
 #[tauri::command]
 pub async fn save_config(app: AppHandle, config: HikariConfig) -> Result<(), String> {
-    let store = app
-        .store("hikari-config.json")
-        .map_err(|e| e.to_string())?;
+    let store = app.store("hikari-config.json").map_err(|e| e.to_string())?;
 
     let value = serde_json::to_value(&config).map_err(|e| e.to_string())?;
     store.set(CONFIG_STORE_KEY, value);
@@ -106,7 +101,10 @@ pub async fn get_usage_stats(
 }
 
 #[tauri::command]
-pub async fn validate_directory(path: String, current_dir: Option<String>) -> Result<String, String> {
+pub async fn validate_directory(
+    path: String,
+    current_dir: Option<String>,
+) -> Result<String, String> {
     use std::path::Path;
 
     let path = Path::new(&path);
@@ -136,11 +134,17 @@ pub async fn validate_directory(path: String, current_dir: Option<String>) -> Re
 
     // Check if the path exists and is a directory
     if !expanded_path.exists() {
-        return Err(format!("Directory does not exist: {}", expanded_path.display()));
+        return Err(format!(
+            "Directory does not exist: {}",
+            expanded_path.display()
+        ));
     }
 
     if !expanded_path.is_dir() {
-        return Err(format!("Path is not a directory: {}", expanded_path.display()));
+        return Err(format!(
+            "Path is not a directory: {}",
+            expanded_path.display()
+        ));
     }
 
     // Return the canonicalized (absolute) path
@@ -151,7 +155,9 @@ pub async fn validate_directory(path: String, current_dir: Option<String>) -> Re
 }
 
 #[tauri::command]
-pub async fn load_saved_achievements(app: AppHandle) -> Result<Vec<AchievementUnlockedEvent>, String> {
+pub async fn load_saved_achievements(
+    app: AppHandle,
+) -> Result<Vec<AchievementUnlockedEvent>, String> {
     use chrono::Utc;
 
     // Load achievements from persistent store
@@ -162,9 +168,7 @@ pub async fn load_saved_achievements(app: AppHandle) -> Result<Vec<AchievementUn
     for achievement_id in &progress.unlocked {
         let mut info = get_achievement_info(achievement_id);
         info.unlocked_at = Some(Utc::now()); // We don't store timestamps, so just use now
-        events.push(AchievementUnlockedEvent {
-            achievement: info,
-        });
+        events.push(AchievementUnlockedEvent { achievement: info });
     }
 
     Ok(events)
@@ -180,3 +184,117 @@ pub async fn answer_question(
     let mut manager = bridge_manager.lock();
     manager.send_tool_result(&conversation_id, &tool_use_id, answers)
 }
+
+#[tauri::command]
+pub async fn list_skills() -> Result<Vec<String>, String> {
+    use std::fs;
+    use std::path::Path;
+
+    // Get the home directory
+    let home =
+        std::env::var_os("HOME").ok_or_else(|| "Could not determine home directory".to_string())?;
+
+    let skills_dir = Path::new(&home).join(".claude").join("skills");
+
+    // If the skills directory doesn't exist, return empty list
+    if !skills_dir.exists() {
+        return Ok(Vec::new());
+    }
+
+    // Read the directory and collect skill names
+    let mut skills = Vec::new();
+    let entries =
+        fs::read_dir(&skills_dir).map_err(|e| format!("Failed to read skills directory: {}", e))?;
+
+    for entry in entries {
+        let entry = entry.map_err(|e| format!("Failed to read directory entry: {}", e))?;
+        let path = entry.path();
+
+        // Only include directories that contain a SKILL.md file
+        if path.is_dir() {
+            let skill_file = path.join("SKILL.md");
+            if skill_file.exists() {
+                if let Some(name) = path.file_name() {
+                    skills.push(name.to_string_lossy().to_string());
+                }
+            }
+        }
+    }
+
+    // Sort alphabetically
+    skills.sort();
+
+    Ok(skills)
+}
+
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
+pub struct UpdateInfo {
+    pub current_version: String,
+    pub latest_version: String,
+    pub has_update: bool,
+    pub release_url: String,
+    pub release_notes: Option<String>,
+}
+
+#[derive(Debug, serde::Deserialize)]
+struct GiteaRelease {
+    tag_name: String,
+    html_url: String,
+    body: Option<String>,
+    prerelease: bool,
+}
+
+#[tauri::command]
+pub async fn check_for_updates() -> Result<UpdateInfo, String> {
+    const CURRENT_VERSION: &str = env!("CARGO_PKG_VERSION");
+    const RELEASES_API: &str =
+        "https://git.nhcarrigan.com/api/v1/repos/nhcarrigan/hikari-desktop/releases";
+
+    // Fetch releases from Gitea API
+    let client = reqwest::Client::new();
+    let response = client
+        .get(RELEASES_API)
+        .header("Accept", "application/json")
+        .send()
+        .await
+        .map_err(|e| format!("Failed to fetch releases: {}", e))?;
+
+    if !response.status().is_success() {
+        return Err(format!("API returned status: {}", response.status()));
+    }
+
+    let text = response
+        .text()
+        .await
+        .map_err(|e| format!("Failed to read response: {}", e))?;
+
+    let releases: Vec<GiteaRelease> =
+        serde_json::from_str(&text).map_err(|e| format!("Failed to parse releases: {}", e))?;
+
+    // Find the latest non-prerelease, or fall back to latest prerelease
+    let latest = releases
+        .iter()
+        .find(|r| !r.prerelease)
+        .or_else(|| releases.first());
+
+    let latest = match latest {
+        Some(r) => r,
+        None => return Err("No releases found".to_string()),
+    };
+
+    // Parse version strings (remove 'v' prefix if present)
+    let current = semver::Version::parse(CURRENT_VERSION)
+        .map_err(|e| format!("Failed to parse current version: {}", e))?;
+
+    let latest_tag = latest.tag_name.trim_start_matches('v');
+    let latest_ver = semver::Version::parse(latest_tag)
+        .map_err(|e| format!("Failed to parse latest version: {}", e))?;
+
+    Ok(UpdateInfo {
+        current_version: CURRENT_VERSION.to_string(),
+        latest_version: latest.tag_name.clone(),
+        has_update: latest_ver > current,
+        release_url: latest.html_url.clone(),
+        release_notes: latest.body.clone(),
+    })
+}