feat(ui): show file path and Reset to Scanned in the metadata editor

Complete the metadata editor modal to match the backend override work:

- File Path: read-only, monospace field showing the resolved on-disk
  location (MediaDetail.FileLocation), next to Format and File Size, so
  admins can see exactly which file backs the record without leaving the
  editor. Renders empty for non-admins, who never receive the path.
- Reset to Scanned: new button beside Rescan. It confirms, then calls
  POST /api/media-items/:id/rescan?reset_overrides=true to drop all
  per-field user overrides and re-extract scanned defaults. Rescan alone
  keeps customizations; Reset discards them.

templates/book_detail_modals.templ

@@ -586,22 +586,41 @@ templ MetadataEditorModal(book handlers.MediaDetail) {
 									class="input opacity-60" />
 							</div>
 						</div>
+						<div>
+							<label class="block text-xs font-semibold uppercase tracking-wide mb-1" style="color: var(--text-secondary);">File Path</label>
+							<input type="text" value={ book.FileLocation } readonly
+								class="input opacity-60 font-mono text-xs" />
+						</div>
 						</div>
 					</div>
 				</div>
 			</div>
 		<div class="flex items-center justify-between p-6 border-t flex-shrink-0" style="border-color: var(--border);">
-			<button
-				@click="rescanBook()"
-				:disabled="rescanning"
-				class="btn btn-secondary"
-			>
-				<span x-show="!rescanning" class="inline-flex items-center gap-2">@Icon("sync", "h-4 w-4")<span>Rescan</span></span>
-				<svg x-show="rescanning" class="animate-spin inline-block h-5 w-5" viewBox="0 0 24 24" fill="none">
-					<circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle>
-					<path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z"></path>
-				</svg>
-			</button>
+			<div class="flex items-center gap-2">
+				<button
+					@click="rescanBook()"
+					:disabled="rescanning"
+					class="btn btn-secondary"
+				>
+					<span x-show="!rescanning" class="inline-flex items-center gap-2">@Icon("sync", "h-4 w-4")<span>Rescan</span></span>
+					<svg x-show="rescanning" class="animate-spin inline-block h-5 w-5" viewBox="0 0 24 24" fill="none">
+						<circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle>
+						<path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z"></path>
+					</svg>
+				</button>
+				<button
+					@click="resetMetadata()"
+					:disabled="resetting"
+					class="btn btn-secondary"
+					title="Discard all manual edits and restore scanned metadata"
+				>
+					<span x-show="!resetting" class="inline-flex items-center gap-2">@Icon("refresh", "h-4 w-4")<span>Reset to Scanned</span></span>
+					<svg x-show="resetting" class="animate-spin inline-block h-5 w-5" viewBox="0 0 24 24" fill="none">
+						<circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle>
+						<path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z"></path>
+					</svg>
+				</button>
+			</div>
 			<div class="flex space-x-3">
 				<button
 					@click="hideMetadataEditor()"

templates/book_detail_modals_templ.go

@@ -1320,7 +1320,20 @@ func MetadataEditorModal(book handlers.MediaDetail) templ.Component {
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
-		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 124, "\" readonly class=\"input opacity-60\"></div></div></div></div></div></div><div class=\"flex items-center justify-between p-6 border-t flex-shrink-0\" style=\"border-color: var(--border);\"><button @click=\"rescanBook()\" :disabled=\"rescanning\" class=\"btn btn-secondary\"><span x-show=\"!rescanning\" class=\"inline-flex items-center gap-2\">")
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 124, "\" readonly class=\"input opacity-60\"></div></div><div><label class=\"block text-xs font-semibold uppercase tracking-wide mb-1\" style=\"color: var(--text-secondary);\">File Path</label> <input type=\"text\" value=\"")
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		var templ_7745c5c3_Var73 string
+		templ_7745c5c3_Var73, templ_7745c5c3_Err = templ.ResolveAttributeValue(book.FileLocation)
+		if templ_7745c5c3_Err != nil {
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `templates/book_detail_modals.templ`, Line: 591, Col: 51}
+		}
+		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ_7745c5c3_Var73)
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 125, "\" readonly class=\"input opacity-60 font-mono text-xs\"></div></div></div></div></div><div class=\"flex items-center justify-between p-6 border-t flex-shrink-0\" style=\"border-color: var(--border);\"><div class=\"flex items-center gap-2\"><button @click=\"rescanBook()\" :disabled=\"rescanning\" class=\"btn btn-secondary\"><span x-show=\"!rescanning\" class=\"inline-flex items-center gap-2\">")
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
@@ -1328,7 +1341,15 @@ func MetadataEditorModal(book handlers.MediaDetail) templ.Component {
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
-		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 125, "<span>Rescan</span></span> <svg x-show=\"rescanning\" class=\"animate-spin inline-block h-5 w-5\" viewBox=\"0 0 24 24\" fill=\"none\"><circle class=\"opacity-25\" cx=\"12\" cy=\"12\" r=\"10\" stroke=\"currentColor\" stroke-width=\"4\"></circle> <path class=\"opacity-75\" fill=\"currentColor\" d=\"M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z\"></path></svg></button><div class=\"flex space-x-3\"><button @click=\"hideMetadataEditor()\" class=\"btn btn-secondary\">Cancel</button> <button @click=\"saveMetadata()\" class=\"btn btn-primary\">")
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 126, "<span>Rescan</span></span> <svg x-show=\"rescanning\" class=\"animate-spin inline-block h-5 w-5\" viewBox=\"0 0 24 24\" fill=\"none\"><circle class=\"opacity-25\" cx=\"12\" cy=\"12\" r=\"10\" stroke=\"currentColor\" stroke-width=\"4\"></circle> <path class=\"opacity-75\" fill=\"currentColor\" d=\"M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z\"></path></svg></button> <button @click=\"resetMetadata()\" :disabled=\"resetting\" class=\"btn btn-secondary\" title=\"Discard all manual edits and restore scanned metadata\"><span x-show=\"!resetting\" class=\"inline-flex items-center gap-2\">")
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		templ_7745c5c3_Err = Icon("refresh", "h-4 w-4").Render(ctx, templ_7745c5c3_Buffer)
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 127, "<span>Reset to Scanned</span></span> <svg x-show=\"resetting\" class=\"animate-spin inline-block h-5 w-5\" viewBox=\"0 0 24 24\" fill=\"none\"><circle class=\"opacity-25\" cx=\"12\" cy=\"12\" r=\"10\" stroke=\"currentColor\" stroke-width=\"4\"></circle> <path class=\"opacity-75\" fill=\"currentColor\" d=\"M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z\"></path></svg></button></div><div class=\"flex space-x-3\"><button @click=\"hideMetadataEditor()\" class=\"btn btn-secondary\">Cancel</button> <button @click=\"saveMetadata()\" class=\"btn btn-primary\">")
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
@@ -1336,7 +1357,7 @@ func MetadataEditorModal(book handlers.MediaDetail) templ.Component {
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
-		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 126, "Save</button></div></div></div></div>")
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 128, "Save</button></div></div></div></div>")
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}

web/src/book-detail.ts

@@ -96,6 +96,7 @@ interface MetadataEditorState {
   coverAction: string;
   saving: boolean;
   rescanning: boolean;
+  resetting: boolean;
   userRating: number;
   ratingHover: number;
   ratingSaving: boolean;
@@ -109,6 +110,7 @@ interface MetadataEditorState {
   removeCover(): void;
   saveMetadata(): Promise<void>;
   rescanBook(): Promise<void>;
+  resetMetadata(): Promise<void>;
   starFill(i: number): string;
   ratingText(): string;
   setRating(value: number): Promise<void>;
@@ -142,6 +144,7 @@ Alpine.data("bookDetail", () => {
     coverAction: "keep",
     saving: false,
     rescanning: false,
+    resetting: false,
     userRating: 0,
     ratingHover: 0,
     ratingSaving: false,
@@ -550,6 +553,41 @@ Alpine.data("bookDetail", () => {
       }
     },
 
+    async resetMetadata() {
+      if (this.resetting) return;
+      if (
+        !window.confirm(
+          "Reset all metadata to scanned defaults? Manual edits and custom covers will be discarded.",
+        )
+      ) {
+        return;
+      }
+      this.resetting = true;
+      const mediaId = getMediaId();
+      try {
+        const resp = await fetch(
+          `/api/media-items/${mediaId}/rescan?reset_overrides=true`,
+          {
+            method: "POST",
+            headers: { Authorization: getAuthHeader() },
+          },
+        );
+        if (!resp.ok) {
+          const err = await resp.json().catch(() => ({}));
+          throw new Error(err.error || "Failed to reset metadata");
+        }
+        showToast("Metadata reset to scanned defaults", "success");
+        setTimeout(() => window.location.reload(), 500);
+      } catch (e) {
+        showToast(
+          e instanceof Error ? e.message : "Failed to reset metadata",
+          "error",
+        );
+      } finally {
+        this.resetting = false;
+      }
+    },
+
     async searchEditorTags() {
       const libraryId = document.body.getAttribute("data-library-id") || "";
       if (!this.tagSearch || this.tagSearch.length < 2 || !libraryId) {