feat: add quick actions panel for common prompts

- Add Rust backend for managing quick actions with persistent storage
- Create QuickActionsPanel component with edit/delete functionality
- Add quickActions store for frontend state management
- Move Actions and Snippets buttons to input controls row
- Include 6 default quick actions: Review PR, Run Tests, Explain File,
  Fix Error, Write Tests, and Refactor
- Support custom quick action creation and management

Closes #15

src/lib/components/InputBar.svelte

@@ -26,6 +26,7 @@
   } from "$lib/commands/slashCommands";
   import AttachmentPreview from "$lib/components/AttachmentPreview.svelte";
   import SnippetLibraryPanel from "$lib/components/SnippetLibraryPanel.svelte";
+  import QuickActionsPanel from "$lib/components/QuickActionsPanel.svelte";
   import type { Attachment } from "$lib/types/messages";
 
   const INPUT_HISTORY_KEY = "hikari-input-history";
@@ -41,6 +42,7 @@
   let attachments = $state<Attachment[]>([]);
   let isDragging = $state(false);
   let showSnippetLibrary = $state(false);
+  let showQuickActions = $state(false);
 
   // Input history state
   let inputHistory = $state<string[]>([]);
@@ -629,6 +631,42 @@ User: ${formattedMessage}`;
     userHasTyped = true;
   }
 
+  async function handleQuickAction(prompt: string): Promise<void> {
+    // Quick actions send the prompt directly
+    if (!isConnected || isSubmitting) return;
+
+    // Add to history
+    addToHistory(prompt);
+    historyIndex = -1;
+    tempInput = "";
+    userHasTyped = false;
+
+    isSubmitting = true;
+
+    // Reset notification state for new user message
+    handleNewUserMessage();
+
+    claudeStore.addLine("user", prompt);
+    characterState.setState("thinking");
+
+    try {
+      const conversationId = get(claudeStore.activeConversationId);
+      if (!conversationId) {
+        throw new Error("No active conversation");
+      }
+      await invoke("send_prompt", {
+        conversationId,
+        message: prompt,
+      });
+    } catch (error) {
+      console.error("Failed to send quick action:", error);
+      claudeStore.addLine("error", `Failed to send: ${error}`);
+      characterState.setTemporaryState("error", 3000);
+    } finally {
+      isSubmitting = false;
+    }
+  }
+
   function handleKeyDown(event: KeyboardEvent) {
     // Handle command menu navigation
     if (showCommandMenu && matchingCommands.length > 0) {
@@ -705,6 +743,50 @@ User: ${formattedMessage}`;
 
   <div class="input-controls flex gap-2 mb-2">
     <MessageModeSelector />
+    <button
+      type="button"
+      onclick={() => (showQuickActions = true)}
+      class="control-button"
+      title="Quick Actions"
+    >
+      <svg
+        width="16"
+        height="16"
+        viewBox="0 0 24 24"
+        fill="none"
+        stroke="currentColor"
+        stroke-width="2"
+        stroke-linecap="round"
+        stroke-linejoin="round"
+      >
+        <path d="M13 10V3L4 14h7v7l9-11h-7z" />
+      </svg>
+      <span>Actions</span>
+    </button>
+    <button
+      type="button"
+      onclick={() => (showSnippetLibrary = true)}
+      class="control-button"
+      title="Snippet Library"
+    >
+      <svg
+        width="16"
+        height="16"
+        viewBox="0 0 24 24"
+        fill="none"
+        stroke="currentColor"
+        stroke-width="2"
+        stroke-linecap="round"
+        stroke-linejoin="round"
+      >
+        <path d="M14.5 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V7.5L14.5 2z" />
+        <polyline points="14,2 14,8 20,8" />
+        <line x1="16" y1="13" x2="8" y2="13" />
+        <line x1="16" y1="17" x2="8" y2="17" />
+        <line x1="10" y1="9" x2="8" y2="9" />
+      </svg>
+      <span>Snippets</span>
+    </button>
   </div>
 
   <div class="input-row">
@@ -735,29 +817,6 @@ User: ${formattedMessage}`;
     </div>
 
     <div class="button-wrapper">
-      <button
-        type="button"
-        onclick={() => (showSnippetLibrary = true)}
-        class="attach-button"
-        title="Snippet Library"
-      >
-        <svg
-          width="20"
-          height="20"
-          viewBox="0 0 24 24"
-          fill="none"
-          stroke="currentColor"
-          stroke-width="2"
-          stroke-linecap="round"
-          stroke-linejoin="round"
-        >
-          <path d="M14.5 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V7.5L14.5 2z" />
-          <polyline points="14,2 14,8 20,8" />
-          <line x1="16" y1="13" x2="8" y2="13" />
-          <line x1="16" y1="17" x2="8" y2="17" />
-          <line x1="10" y1="9" x2="8" y2="9" />
-        </svg>
-      </button>
       <button type="button" onclick={handleFilePicker} class="attach-button" title="Attach files">
         <svg
           width="20"
@@ -811,6 +870,13 @@ User: ${formattedMessage}`;
   />
 {/if}
 
+{#if showQuickActions}
+  <QuickActionsPanel
+    onClose={() => (showQuickActions = false)}
+    onAction={handleQuickAction}
+  />
+{/if}
+
 <style>
   .input-bar {
     display: flex;
@@ -853,6 +919,32 @@ User: ${formattedMessage}`;
     gap: 8px;
   }
 
+  .control-button {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    gap: 8px;
+    padding: 10px 16px;
+    background: var(--bg-secondary);
+    border: 1px solid var(--border-color);
+    border-radius: 8px;
+    color: var(--text-secondary);
+    cursor: pointer;
+    transition: all 0.2s;
+    font-size: 14px;
+    white-space: nowrap;
+  }
+
+  .control-button:hover {
+    background: var(--bg-tertiary);
+    border-color: var(--accent-primary);
+    color: var(--accent-primary);
+  }
+
+  .control-button:active {
+    transform: scale(0.95);
+  }
+
   .input-row {
     display: flex;
     gap: 12px;