feat(about): 关于页展示 Web 引擎与 WebView 完整版本号(桌面 + 移动端) - #773

Reader features vary per engine (@layer/:has floors, execCommand,
clipboard behavior), so bug reports need the engine name and build, not
just the app version. Add a Web-engine row under the app version in
Settings → About, parsed from the UA per Tauri platform:
- Windows: WebView2 (Edg/ token = real Evergreen build)
- Android: system WebView (Chrome/ token, ; wv) marker)
- macOS/iOS: WebKit via the Version/ token (follows the system release,
 unlike readest's frozen AppleWebKit/605.1.15 parse)
- Linux: WebKitGTK without a version — the UA carries only frozen
 tokens; the real one is the system libwebkit2gtk package
- plain vite dev in a browser: generic Chrome/Edge/Firefox/Safari labels
Labels localized for all 7 locales (settings.webviewEngine).

...sion label
The UA string is reduced (Edg/152.0.0.0 on a 152.0.4191.62 WebView2
runtime), so the UA-parsed version showed zeros after the major.
Fetch fullVersionList via User-Agent Client Hints for Chromium-family
engines (WebView2 -> Microsoft Edge, Android WebView -> Android
WebView, Chrome -> Google Chrome) and fall back to the UA value
elsewhere. Rename the About row label to the plainer
settings.webviewVersion in all locales.

Hovering the version card reveals a copy button (readest's About window
has the same affordance — mobile users can't select the version string
for bug reports). Copies both lines at once:
 ReadAny 1.3.5
 WebView2 152.0.4191.62
Feedback via icon swap + toast (common.copied). Uses the same
navigator.clipboard.writeText as the chat/markdown copy buttons.

Hover-reveal hid the affordance; keep it visible like the neighboring
check-update button.

The webview-version feature was desktop-only; bring it to the Expo app's
About screen:
- Move the UA parser to core (packages/core/src/utils/webview-info.ts)
 so both apps produce identical engine/version labels; the desktop
 wrapper keeps its Tauri check and Client Hints lookup.
- The mobile app has no real UA (App.tsx polyfills "ReactNative"), so
 reader.html now reports its own navigator.userAgent over the RN bridge
 once at startup (type: readany-ua); use-reader-bridge stores it in a
 small zustand store. It is the system WebView's actual UA — the exact
 engine the book content renders in.
- AboutScreen gains a tappable WebView-version row: touch has no hover,
 so the row itself is the affordance — tapping copies both versions
 (ReadAny vX + engine label) via expo-clipboard, with a transient
 check-mark feedback. Before a book is opened it shows the engine name
 without a build.

readest's mobile app can show the engine at launch because its entire
UI runs inside the system WebView; our native UI has no webview until a
book is opened, so the About screen previously fell back to an
engine-only label. Add a 0x0 hidden probe WebView that posts its
navigator.userAgent to the webview-info store on first launch and then
unmounts — the About screen shows the full engine/build immediately,
and the reader bridge keeps it fresh afterwards.

Android system WebViews reduce their UA too (Chrome/138.0.0.0), so the
probe now also asks Client Hints for fullVersionList and stores the real
build alongside the UA; the reader bridge keeps it when its messages
carry no version. About label prefers the full build.

Drop the separate labeled section and its copy hint — show the web
engine build as a second line right under v1.3.6, and make the
two-line block itself tappable to copy both. Matches the desktop
About card's behavior with a flatter mobile layout.

The installed expo is 54.0.33 (SDK 54); the About screen hardcoded
"Expo SDK 55" and drifted. Derive the label from the expo package's
major version (matches the SDK number since SDK 51) so it follows
future upgrades, and fix the platform-service comment.

...dcoded 55"
This reverts commit efa154c.

Bug reports need the engine axis (justify fallbacks, clipboard, and CSS
capability floors all vary per webview build). Add an optional
DeviceInfo.webview to the shared type, fill it on both apps:
- desktop: full build via Client Hints (getWebviewLabel)
- mobile: engine + build from the reader-UA store (probe/bridge)
and render it as a WebView line in the worker's GitHub issue body
(packages/feedback-worker), falling back to "unknown" for old
clients. The field is optional, so payloads from versions without this
change keep submitting fine.

OCR code review follow-ups (all severities):
- core parser: Android UA without the wv marker no longer falls through
 to WebKitGTK; Apple platforms fall back to the OS x_y token when the
 Version/ token is absent (embedded WKWebView UAs often omit it)
- UAProbe: unmount after a 5s timeout or WebView error instead of
 staying mounted all session; guard the injected postMessage; brand
 list cross-referenced with the desktop client-hints lookup
- AboutScreen/AboutSettings: copy feedback timer cleared on unmount;
 copied confirmation renders even when the engine label is empty;
 copy payload format unified across platforms
- feedback worker: device fields sanitized before issue-body render
- webview-info parser: table-driven unit tests (13 cases) added

Device fields are client-supplied and rendered verbatim into issue
Markdown — strip line breaks and Markdown-significant characters
(backticks, brackets, angle brackets, bangs) and cap length so they
cannot inject headings, links, or mentions.

Metro's Windows fallback watcher fatally crashed (ENOENT) on transient
files under packages/app/src-tauri/target while the desktop tauri
dev/build ran, killing the mobile bundler. Exclude src-tauri/target
from the Metro file map via blockList.

The settings/onboarding language handlers dynamically imported
@readany/core/i18n; in dev Metro serves that as an on-demand module
bundle which failed to load on this Windows setup, so the language
switch silently died in the catch. The module is already in the
startup bundle (App.tsx imports it), so import it statically.

Medium:
- feedback worker: sanitize strips @ so device fields cannot inject
 GitHub mentions; also flattens line breaks and caps length
- UAProbe: unmounts after a 5s timeout or WebView error instead of
 staying mounted all session when the injected script never reports
- AboutScreen: copied confirmation renders even when the engine label
 is empty (tap is always acknowledged)
- core parser: Apple platforms fall back to the OS x_y token when the
 Version/ token is absent (embedded WKWebView UAs often omit it)
- build-reader entry: reports the Client Hints full build with the UA
 (the reader page is a secure context, unlike the probe's inline HTML)
Low:
- store: fallback keyed on a missing engine; ?? -> || so an empty
 fullVersion falls back to the UA parse; fallback lookup map instead
 of nested ternaries
- lib/webview-info: brand match loosened to /Microsoft Edge/i (WebView2
 reports a distinct brand); reuses core formatWebviewInfo; drops the
 dead || version
- AboutSettings: type=button on the copy/update buttons; '...' webview
 placeholder; failure surfaces via toast.error; timer cleanup on
 unmount
- AboutScreen: copy payload format unified with desktop (no v prefix);
 timer cleanup on unmount
- core parser: table-driven unit tests (13 UA samples)

...on UA report)