feat: add multiple productivity features and UI enhancements (#68)

## Summary

This PR adds a collection of productivity features and UI enhancements to improve the Hikari Desktop experience:

### New Features
- **Clipboard History** (#25) - Track and manage copied code snippets with language detection, search, filtering, and pinning
- **Quick Actions Panel** (#15) - Buttons for common quick actions like "Review PR", "Run tests", "Explain file", with customizable actions
- **Git Integration Panel** (#24) - View current branch, changed/staged files, quick git actions (commit, push, pull), and branch management
- **Session Import/Export** (#8) - Export conversations to JSON and import previously saved sessions
- **Snippet Library** (#22) - Save and reuse common prompts with categories and quick insert
- **Session History** (#14) - Auto-save conversations with browsable history and search
- **High Contrast Mode** (#20) - Accessibility theme with improved visibility
- **Minimize to System Tray** (#11) - System tray support with right-click menu

### UI Enhancements
- Trans-pride gradient theme applied across UI elements
- Copy button added to code blocks
- Linter formatting and eslint-disable comments for cleaner code

## Closes

Closes #8
Closes #11
Closes #14
Closes #15
Closes #20
Closes #22
Closes #24
Closes #25
Closes #34
Closes #35
Closes #36
Closes #37
Closes #69
Closes #70

## Test Plan

- [ ] Verify clipboard history captures code from code block copy buttons
- [ ] Verify clipboard history captures manually selected text from terminal
- [ ] Test snippet library CRUD operations and insertion
- [ ] Test quick actions panel with default and custom actions
- [ ] Test git panel shows correct status, branch, and performs git operations
- [ ] Test session history auto-save and restore
- [ ] Test session import/export roundtrip
- [ ] Verify high contrast mode provides adequate contrast
- [ ] Test minimize to tray functionality and tray menu
- [ ] Verify trans-pride gradient theme displays correctly in all themes

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

Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Reviewed-on: #68
Co-authored-by: Hikari <hikari@nhcarrigan.com>
Co-committed-by: Hikari <hikari@nhcarrigan.com>

src/lib/components/InputBar.svelte

@@ -7,6 +7,7 @@
   import { characterState } from "$lib/stores/character";
   import { handleNewUserMessage } from "$lib/notifications/rules";
   import { setSkipNextGreeting } from "$lib/tauri";
+  import { clipboardStore } from "$lib/stores/clipboard";
   import {
     setShouldRestoreHistory,
     setSavedHistory,
@@ -24,7 +25,11 @@
     isSlashCommand,
     type SlashCommand,
   } from "$lib/commands/slashCommands";
+  import { configStore, isStreamerMode } from "$lib/stores/config";
   import AttachmentPreview from "$lib/components/AttachmentPreview.svelte";
+  import SnippetLibraryPanel from "$lib/components/SnippetLibraryPanel.svelte";
+  import QuickActionsPanel from "$lib/components/QuickActionsPanel.svelte";
+  import ClipboardHistoryPanel from "$lib/components/ClipboardHistoryPanel.svelte";
   import type { Attachment } from "$lib/types/messages";
 
   const INPUT_HISTORY_KEY = "hikari-input-history";
@@ -39,6 +44,14 @@
   let selectedCommandIndex = $state(0);
   let attachments = $state<Attachment[]>([]);
   let isDragging = $state(false);
+  let showSnippetLibrary = $state(false);
+  let showQuickActions = $state(false);
+  let showClipboardHistory = $state(false);
+  let streamerModeActive = $state(false);
+
+  isStreamerMode.subscribe((value) => {
+    streamerModeActive = value;
+  });
 
   // Input history state
   let inputHistory = $state<string[]>([]);
@@ -500,6 +513,15 @@ User: ${formattedMessage}`;
     const items = event.clipboardData?.items;
     let handledFile = false;
 
+    // Also capture text content to clipboard history
+    const textContent = event.clipboardData?.getData("text/plain");
+    if (textContent && textContent.trim().length > 0) {
+      // Only capture multi-line or longer text (likely code snippets)
+      if (textContent.includes("\n") || textContent.length > 50) {
+        clipboardStore.captureClipboard(textContent, null, "Pasted into chat");
+      }
+    }
+
     if (items && items.length > 0) {
       for (const item of items) {
         if (item.kind === "file") {
@@ -617,6 +639,62 @@ User: ${formattedMessage}`;
     }
   }
 
+  function handleSnippetInsert(content: string): void {
+    // Insert snippet at cursor position or append to input
+    if (inputValue.trim()) {
+      inputValue = inputValue + "\n\n" + content;
+    } else {
+      inputValue = content;
+    }
+    userHasTyped = true;
+  }
+
+  function handleClipboardInsert(content: string): void {
+    // Insert clipboard content at cursor position or append to input
+    if (inputValue.trim()) {
+      inputValue = inputValue + "\n\n" + content;
+    } else {
+      inputValue = content;
+    }
+    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) {
@@ -693,6 +771,99 @@ User: ${formattedMessage}`;
 
   <div class="input-controls flex gap-2 mb-2">
     <MessageModeSelector />
+    <button
+      type="button"
+      onclick={() => configStore.toggleStreamerMode()}
+      class="control-button streamer-toggle"
+      class:streamer-active={streamerModeActive}
+      title="Toggle Streamer Mode (Ctrl+Shift+S)"
+    >
+      {#if streamerModeActive}
+        <div class="live-indicator"></div>
+        <span>LIVE</span>
+      {:else}
+        <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="M1 12s4-8 11-8 11 8 11 8-4 8-11 8-11-8-11-8z" />
+          <circle cx="12" cy="12" r="3" />
+          <line x1="1" y1="1" x2="23" y2="23" />
+        </svg>
+        <span>Stream</span>
+      {/if}
+    </button>
+    <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>
+    <button
+      type="button"
+      onclick={() => (showClipboardHistory = true)}
+      class="control-button"
+      title="Clipboard History"
+    >
+      <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="M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2" />
+        <rect x="9" y="3" width="6" height="4" rx="1" />
+      </svg>
+      <span>Clipboard</span>
+    </button>
   </div>
 
   <div class="input-row">
@@ -717,8 +888,7 @@ User: ${formattedMessage}`;
         style="height: {textareaHeight}px; font-size: var(--terminal-font-size, 14px);"
         class="w-full px-4 py-3 bg-[var(--bg-secondary)] border border-[var(--border-color)]
              rounded-lg text-[var(--text-primary)] placeholder-gray-500 resize-none
-             focus:outline-none focus:border-[var(--accent-primary)] focus:ring-1 focus:ring-[var(--accent-primary)]
-             disabled:opacity-50 disabled:cursor-not-allowed"
+             input-trans-focus disabled:opacity-50 disabled:cursor-not-allowed"
       ></textarea>
     </div>
 
@@ -744,7 +914,7 @@ User: ${formattedMessage}`;
         <button
           type="button"
           onclick={handleInterrupt}
-          class="send-button bg-red-600 hover:bg-red-700"
+          class="send-button btn-trans-gradient"
           title="Interrupt the current response (Ctrl+C)"
         >
           <span class="font-bold">■</span> Stop
@@ -755,7 +925,7 @@ User: ${formattedMessage}`;
           disabled={!isConnected ||
             isSubmitting ||
             (!inputValue.trim() && attachments.length === 0)}
-          class="send-button bg-[var(--accent-primary)] hover:bg-[var(--accent-secondary)]
+          class="send-button trans-gradient-button
                disabled:opacity-50 disabled:cursor-not-allowed"
         >
           {#if isSubmitting}
@@ -769,6 +939,25 @@ User: ${formattedMessage}`;
   </div>
 </form>
 
+{#if showSnippetLibrary}
+  <SnippetLibraryPanel
+    onClose={() => (showSnippetLibrary = false)}
+    onInsert={handleSnippetInsert}
+  />
+{/if}
+
+{#if showQuickActions}
+  <QuickActionsPanel onClose={() => (showQuickActions = false)} onAction={handleQuickAction} />
+{/if}
+
+{#if showClipboardHistory}
+  <ClipboardHistoryPanel
+    isOpen={showClipboardHistory}
+    onClose={() => (showClipboardHistory = false)}
+    onInsert={handleClipboardInsert}
+  />
+{/if}
+
 <style>
   .input-bar {
     display: flex;
@@ -811,6 +1000,72 @@ 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);
+  }
+
+  .streamer-toggle.streamer-active {
+    background: rgba(239, 68, 68, 0.2);
+    border-color: rgb(239, 68, 68);
+    color: rgb(248, 113, 113);
+    animation: pulse-red 2s ease-in-out infinite;
+  }
+
+  .streamer-toggle.streamer-active:hover {
+    background: rgba(239, 68, 68, 0.3);
+    border-color: rgb(248, 113, 113);
+  }
+
+  .live-indicator {
+    width: 8px;
+    height: 8px;
+    border-radius: 50%;
+    background: rgb(239, 68, 68);
+    animation: pulse-dot 1.5s ease-in-out infinite;
+  }
+
+  @keyframes pulse-red {
+    0%,
+    100% {
+      box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4);
+    }
+    50% {
+      box-shadow: 0 0 0 4px rgba(239, 68, 68, 0);
+    }
+  }
+
+  @keyframes pulse-dot {
+    0%,
+    100% {
+      opacity: 1;
+    }
+    50% {
+      opacity: 0.5;
+    }
+  }
+
   .input-row {
     display: flex;
     gap: 12px;
@@ -899,4 +1154,19 @@ User: ${formattedMessage}`;
   .send-button:active:not(:disabled) {
     transform: scale(0.95);
   }
+
+  .trans-gradient-button {
+    background: var(--trans-gradient-vibrant);
+    border: none;
+    color: #1a1a2e;
+    font-weight: 600;
+    text-shadow: 0 0 2px rgba(255, 255, 255, 0.5);
+  }
+
+  .trans-gradient-button:hover:not(:disabled) {
+    filter: brightness(1.1);
+    box-shadow:
+      0 0 20px rgba(91, 206, 250, 0.4),
+      0 0 30px rgba(245, 169, 184, 0.3);
+  }
 </style>