feat: add image preview with drag-and-drop support

- Add ImagePreview component for displaying embedded image thumbnails
- Enable drag-and-drop functionality for images in FloatingPromptInput
- Configure Tauri asset protocol to properly serve local image files
- Support image mentions via @path syntax in prompts
- Add visual feedback for drag hover states
- Implement full-size image preview dialog with navigation
- Handle duplicate images and limit preview to 10 thumbnails

src-tauri/Cargo.lock

@@ -1768,6 +1768,12 @@ dependencies = [
  "pin-project-lite",
 ]
 
+[[package]]
+name = "http-range"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "21dec9db110f5f872ed9699c3ecf50cf16f423502706ba5c72462e28d3157573"
+
 [[package]]
 name = "httparse"
 version = "1.10.1"
@@ -4075,6 +4081,7 @@ dependencies = [
  "gtk",
  "heck 0.5.0",
  "http",
+ "http-range",
  "jni",
  "libc",
  "log",

src-tauri/Cargo.toml

@@ -18,7 +18,7 @@ crate-type = ["staticlib", "cdylib", "rlib"]
 tauri-build = { version = "2", features = [] }
 
 [dependencies]
-tauri = { version = "2", features = [] }
+tauri = { version = "2", features = ["protocol-asset"] }
 tauri-plugin-opener = "2"
 tauri-plugin-shell = "2"
 tauri-plugin-dialog = "2.0.3"

src-tauri/tauri.conf.json

@@ -18,7 +18,11 @@
       }
     ],
     "security": {
-      "csp": null
+      "csp": "default-src 'self'; img-src 'self' asset: https://asset.localhost blob: data:; style-src 'self' 'unsafe-inline'; script-src 'self' 'unsafe-eval'",
+      "assetProtocol": {
+        "enable": true,
+        "scope": ["**"]
+      }
     }
   },
   "plugins": {