refactor(locale): move hardcoded UI strings into english locale

Adds optional namespaces (common, errors, commandPalette, headTitle,
notifications, schedule, events, home, reader, routes, badgePreview,
badgeWall) and extends existing ones (settings.*, lists.*, tools.*,
user.*, hololive.*) on the Locale interface. New fields are optional
so japanese.ts can omit them; svelte-i18n's fallbackLocale handles
the runtime miss.

HeadTitle gains an optional routeKey prop for type-safe lookup.
defaultActions becomes a factory so the command palette re-reads
locale on language toggle. The existing JP feedback translation
in routes/settings is preserved via japanese.ts.

Out of scope (kept hardcoded): service-worker.ts, app.html,
Landing*.svelte, tools.ts registry, Easter Event 2025 pages.

1 files changed, 32 insertions, 24 deletions

diff --git a/src/lib/CommandPalette/toggleActions.ts b/src/lib/CommandPalette/toggleActions.ts
index ca64ff5f..9ba1d121 100644
--- a/src/lib/CommandPalette/toggleActions.ts
+++ b/src/lib/CommandPalette/toggleActions.ts
@@ -1,4 +1,6 @@
 import settings, { type Settings } from "$stores/settings";
+import locale from "$stores/locale";
+import { get } from "svelte/store";
 import type { CommandPaletteAction } from "./actions";
 
 const TITLE_FORMATS: Settings["displayTitleFormat"][] = [
@@ -51,82 +53,84 @@ export const toggleActions = (current: Settings): CommandPaletteAction[] => {
 	const nextOutbound =
 		OUTBOUND_TARGETS[(outboundIndex + 1) % OUTBOUND_TARGETS.length];
 
+	const t = get(locale)().commandPalette?.toggles;
+
 	return [
 		boolToggle(
 			current.display24HourTime,
 			"display24HourTime",
-			"Switch to 24-hour time",
-			"Switch to 12-hour time",
+			t?.time24On ?? "Switch to 24-hour time",
+			t?.time24Off ?? "Switch to 12-hour time",
 			["time", "clock", "24h", "12h", "format"],
 		),
 		boolToggle(
 			current.displayDisableAnimations,
 			"displayDisableAnimations",
-			"Disable animations",
-			"Enable animations",
+			t?.animationsOff ?? "Disable animations",
+			t?.animationsOn ?? "Enable animations",
 			["motion", "animation", "accessibility"],
 		),
 		boolToggle(
 			current.displayBlurAdultContent,
 			"displayBlurAdultContent",
-			"Blur adult content",
-			"Show adult content unblurred",
+			t?.blurAdultOn ?? "Blur adult content",
+			t?.blurAdultOff ?? "Show adult content unblurred",
 			["nsfw", "adult", "blur", "censor"],
 		),
 		boolToggle(
 			current.displayCoverModeAnime,
 			"displayCoverModeAnime",
-			"Show anime covers",
-			"Hide anime covers",
+			t?.showAnimeCovers ?? "Show anime covers",
+			t?.hideAnimeCovers ?? "Hide anime covers",
 			["cover", "image", "anime", "display"],
 		),
 		boolToggle(
 			current.displayCoverModeManga,
 			"displayCoverModeManga",
-			"Show manga covers",
-			"Hide manga covers",
+			t?.showMangaCovers ?? "Show manga covers",
+			t?.hideMangaCovers ?? "Hide manga covers",
 			["cover", "image", "manga", "novels", "display"],
 		),
 		boolToggle(
 			current.displayHoverCover,
 			"displayHoverCover",
-			"Enable hover cover preview",
-			"Disable hover cover preview",
+			t?.hoverCoverOn ?? "Enable hover cover preview",
+			t?.hoverCoverOff ?? "Disable hover cover preview",
 			["cover", "hover", "preview"],
 		),
 		boolToggle(
 			current.displayScheduleListMode,
 			"displayScheduleListMode",
-			"Schedule: list mode",
-			"Schedule: grid mode",
+			t?.scheduleListMode ?? "Schedule: list mode",
+			t?.scheduleGridMode ?? "Schedule: grid mode",
 			["schedule", "list", "grid", "view"],
 		),
 		boolToggle(
 			current.displayReverseSort,
 			"displayReverseSort",
-			"Reverse sort order",
-			"Restore default sort order",
+			t?.reverseSort ?? "Reverse sort order",
+			t?.restoreSort ?? "Restore default sort order",
 			["sort", "reverse", "order"],
 		),
 		boolToggle(
 			current.displayDataSaver,
 			"displayDataSaver",
-			"Enable data saver",
-			"Disable data saver",
+			t?.dataSaverOn ?? "Enable data saver",
+			t?.dataSaverOff ?? "Disable data saver",
 			["data", "bandwidth", "saver", "performance"],
 		),
 		boolToggle(
 			current.displayDisableNotifications,
 			"displayDisableNotifications",
-			"Disable in-app notifications",
-			"Enable in-app notifications",
+			t?.notificationsOff ?? "Disable in-app notifications",
+			t?.notificationsOn ?? "Enable in-app notifications",
 			["notifications", "alerts", "toast"],
 		),
 		{
 			name:
 				current.displayLanguage === "en"
-					? "Switch language to 日本語"
-					: "Switch language to English",
+					? (t?.switchLanguageJa ?? "Switch language to 日本語")
+					: (t?.switchLanguageEn ?? "Switch language to English"),
 			url: "#",
 			preventDefault: true,
 			tags: ["language", "locale", "translate", "japanese", "english"],
@@ -137,14 +141,18 @@ export const toggleActions = (current: Settings): CommandPaletteAction[] => {
 				),
 		},
 		{
-			name: `Title format: ${current.displayTitleFormat} → ${nextTitle}`,
+			name: (t?.titleFormat ?? "Title format: {from} → {to}")
+				.replace("{from}", current.displayTitleFormat)
+				.replace("{to}", nextTitle),
 			url: "#",
 			preventDefault: true,
 			tags: ["title", "format", "english", "romaji", "native"],
 			onClick: () => settings.setKey("displayTitleFormat", nextTitle),
 		},
 		{
-			name: `Outbound links: ${OUTBOUND_LABELS[current.displayOutboundLinksTo]} → ${OUTBOUND_LABELS[nextOutbound]}`,
+			name: (t?.outboundLinks ?? "Outbound links: {from} → {to}")
+				.replace("{from}", OUTBOUND_LABELS[current.displayOutboundLinksTo])
+				.replace("{to}", OUTBOUND_LABELS[nextOutbound]),
 			url: "#",
 			preventDefault: true,
 			tags: [