v0.0.3: fix settings ignored on real watches + splash version

[eldios]

Summary

Hotfix release for the 0.0.2 regression where the settings page did nothing on a real watch.

• Settings save restored. 0.0.2 sent every setting by name in the pebblejs://close payload. On a real watch that payload is length-limited, so it was truncated mid-JSON, JSON.parse threw in webviewclosed, and the save was silently dropped — settings appeared completely dead. The emulator uses a file:// return_to path and was unaffected, which is why the regression slipped through. Numeric settings now travel positionally (values only, in a fixed shared order in wirekeys.js); app.js expands them back to keys before forwarding the full state to the watch. Payload drops ~3.6× (835 → 232 URL bytes) so it always fits, while WYSIWYG is preserved — every shown value is still applied, no ghost settings. The two string settings and changed translations ride along by name; a legacy flat payload is still decoded for safety.
• Splash version. The calendar-loading splash showed a hard-coded "3.0" (a PebbleTimely leftover); it now shows the real app version.

Versioning

• App version bumped to 0.0.3 everywhere it is stated: package.json, the splash APP_VERSION, the README badge, CHANGELOG.md, and the PUBLISHING.md release notes.
• CONFIG_VERSION (the config-protocol version reported to the JS, on its own sequence — not the app version) is major-bumped 2.6 → 3.0 because the save wire format changed.

Test plan

Verified inside nix develop:

• Encode→decode round-trip with node: all 34 settings survive; the drift/"ghost" case (a shown-but-untouched value) is applied; negative clock2_tz survives; close payload is 232 URL bytes (was ~835).
• wirekeys.js is bundled into build/pebble-js-app.js (require resolves).
• Host unit suite 18/18; pebble build on basalt/diorite/emery/flint; strict-check clean under the cloud -Werror flags.
• Built basalt ELF contains the "0.0.3" splash string.
• Not verified on a physical watch — please confirm a save sticks after install.