chore(export-viewer): rebuild the embedded bundle, and fix the lint ignores

The offline keepsake viewer had the same two filter defects as the app: typed
suggestions were capped so a matching tag could be unselectable, and the dropdown used
`onmousedown` with a backdrop that swallowed the selection. Rebuilt into
`backend/static/export-viewer/index.html`, which `include_dir!` embeds in the binary.

The eslint ignores were unanchored, so once the export-viewer's dependencies were
installed its nested `.svelte-kit` output was linted as source. Anchored with `**/`.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

frontend/export-viewer/package-lock.json

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@@ -944,7 +943,6 @@
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 				"deepmerge": "^4.3.1",
@@ -1291,7 +1289,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"bin": {
 				"acorn": "bin/acorn"
 			},
@@ -1904,7 +1901,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"engines": {
 				"node": ">=12"
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@@ -2024,7 +2020,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
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@@ -2114,7 +2109,6 @@
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 			"dev": true,
 			"license": "Apache-2.0",
-			"peer": true,
 			"bin": {
 				"tsc": "bin/tsc",
 				"tsserver": "bin/tsserver"
@@ -2129,7 +2123,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"esbuild": "^0.27.0",
 				"fdir": "^6.5.0",