feat: add file picker button for attachments (#63)

src/lib/components/InputBar.svelte

@@ -1,5 +1,6 @@
 <script lang="ts">
   import { invoke } from "@tauri-apps/api/core";
+  import { open } from "@tauri-apps/plugin-dialog";
   import { get } from "svelte/store";
   import { claudeStore, isClaudeProcessing } from "$lib/stores/claude";
   import { characterState } from "$lib/stores/character";
@@ -300,6 +301,86 @@ User: ${formattedMessage}`;
     claudeStore.removeAttachment(id);
   }
 
+  async function handleFilePicker() {
+    try {
+      const selected = await open({
+        multiple: true,
+        filters: [
+          {
+            name: "All Files",
+            extensions: ["*"],
+          },
+          {
+            name: "Images",
+            extensions: ["png", "jpg", "jpeg", "gif", "webp", "svg", "bmp"],
+          },
+          {
+            name: "Documents",
+            extensions: ["pdf", "txt", "md", "doc", "docx", "csv", "json", "xml"],
+          },
+          {
+            name: "Code",
+            extensions: [
+              "js",
+              "ts",
+              "jsx",
+              "tsx",
+              "py",
+              "rs",
+              "go",
+              "java",
+              "c",
+              "cpp",
+              "h",
+              "hpp",
+              "css",
+              "html",
+              "svelte",
+              "vue",
+            ],
+          },
+        ],
+      });
+
+      if (!selected) return;
+
+      // Handle both single and multiple file selection
+      const files = Array.isArray(selected) ? selected : [selected];
+
+      for (const filePath of files) {
+        // Get file info
+        const filename = filePath.split(/[/\\]/).pop() || "unknown";
+        const extension = filename.split(".").pop()?.toLowerCase() || "";
+
+        // Determine file type
+        const imageExtensions = ["png", "jpg", "jpeg", "gif", "webp", "svg", "bmp"];
+        const documentExtensions = ["pdf", "txt", "md", "doc", "docx", "csv", "json", "xml"];
+
+        let fileType: "image" | "document" | "other";
+        if (imageExtensions.includes(extension)) {
+          fileType = "image";
+        } else if (documentExtensions.includes(extension)) {
+          fileType = "document";
+        } else {
+          fileType = "other";
+        }
+
+        // Create attachment
+        const attachment: Attachment = {
+          id: `attachment-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`,
+          filename,
+          path: filePath,
+          size: 0, // We don't have easy access to file size from the dialog
+          type: fileType,
+        };
+
+        claudeStore.addAttachment(attachment);
+      }
+    } catch (error) {
+      console.error("Failed to open file picker:", error);
+    }
+  }
+
   function handleKeyDown(event: KeyboardEvent) {
     // Handle command menu navigation
     if (showCommandMenu && matchingCommands.length > 0) {
@@ -397,6 +478,28 @@ User: ${formattedMessage}`;
     </div>
 
     <div class="button-wrapper">
+      <button
+        type="button"
+        onclick={handleFilePicker}
+        class="attach-button"
+        title="Attach files"
+      >
+        <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="M21.44 11.05l-9.19 9.19a6 6 0 0 1-8.49-8.49l9.19-9.19a4 4 0 0 1 5.66 5.66l-9.2 9.19a2 2 0 0 1-2.83-2.83l8.49-8.48"
+          />
+        </svg>
+      </button>
+
       {#if isProcessing}
         <button
           type="button"
@@ -482,6 +585,32 @@ User: ${formattedMessage}`;
     height: 100%;
   }
 
+  .attach-button {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    width: 48px;
+    height: 48px;
+    padding: 0;
+    background: var(--bg-secondary);
+    border: 1px solid var(--border-color);
+    border-radius: 8px;
+    color: var(--text-secondary);
+    cursor: pointer;
+    transition: all 0.2s;
+  }
+
+  .attach-button:hover {
+    background: var(--bg-tertiary);
+    border-color: var(--accent-primary);
+    color: var(--accent-primary);
+    transform: scale(1.05);
+  }
+
+  .attach-button:active {
+    transform: scale(0.95);
+  }
+
   .send-button {
     padding: 0 24px;
     height: 48px;