feat(logging): capture frontend errors to disk with structured redaction

Frontend half of the logging overhaul.

Capture:
- Add a global error boundary plus window error/unhandledrejection
  handlers that persist renderer errors via tauri-plugin-log (new
  @tauri-apps/plugin-log dependency + log:default capability), so a
  white-screen crash leaves a trace.

Redaction (two layers over every logged value):
- Structured serializer: redact by sensitive property name (arrays and
  nested values included) and by opaque value shape.
- Text layer, the universal final pass: redact URL credentials/query,
  auth schemes, known secret shapes, and named-key array/object values.
  The container rule closes prefix+JSON, double-encoded, and POJO-error
  bypasses regardless of which entrypoint the structured data came from.
- Render Errors as redacted message + native stack across V8 and WebKit
  (macOS/Linux) without depending on a single stack format.
- Bound all inputs and drop oversized JSON to keep the UI responsive.

i18n:
- zh / en / ja / zh-TW for the new log settings and error text.

src-tauri/capabilities/default.json

@@ -2,13 +2,12 @@
   "$schema": "../gen/schemas/desktop-schema.json",
   "identifier": "default",
   "description": "enables the default permissions",
-  "windows": [
-    "main"
-  ],
+  "windows": ["main"],
   "permissions": [
     "core:default",
     "opener:default",
     "updater:default",
+    "log:default",
     "core:window:allow-set-skip-taskbar",
     "core:window:allow-start-dragging",
     "core:window:allow-minimize",
@@ -19,4 +18,4 @@
     "process:allow-restart",
     "dialog:default"
   ]
-}
+}