Vue migration

The application UI moves from static templates plus imperative DOM wiring to Vue 3 components with Pinia stores. The migration keeps the experience the same: element ids, classes, the global stylesheet, translations, keyboard shortcuts, voice actions, share links and the phone layout all behave as before. The one intended change is the panel rail described below.

Goals

Views are Vue single-file components; state that several views read lives in Pinia stores rather than in DOM classes.
The owners listed in UI-OWNERSHIP.md keep their responsibilities. A component replaces DOM construction; it does not add a second owner of the same state.
Public methods used by layers, scene playback, voice and host applications (setPanelCollapsed, setContextMode, setStyle, share and location subscriptions) keep their signatures.
Ids and classes used by browser QA and host applications stay stable until a host can use an explicit extension point instead.

The panel rail

Each desktop sidebar gets a floating icon rail that lists every panel available on that side. Selecting an icon opens that panel; selecting it again closes it. One panel is open per side at a time, so the rail replaces the accordion stacking. Panels that are not available in the current mode (for example Weather before a weather layer is active) are shown disabled or omitted as the panel's own availability rule dictates. The rail hides with the rest of the chrome in Cockpit, scene playback, recording and the clean view.

Phones keep the existing bottom tab bar and sheets; the rail is desktop only.

Voice and keyboard openings go through the same panel store, so they follow the one-panel rule too. Share links continue to record which panels are open.

Component kit

src/ui/kit/ holds the generic components (UiRail, UiPanel, UiButton, UiChip, UiTooltip and so on). Names, props and events follow Halfpixel's ui-vue kit so the two can converge later, but the components are written for this repository and styled by its existing stylesheet and custom properties. They contain no application state.

Phases

Foundation. Vue, Pinia and the Vite Vue plugin join the browser build (build/vite.js, so host applications receive them too). One Vue app is mounted beside the existing markup with a shared Pinia instance. Stores mirror the state that owners already publish: panel disclosure, the UI theme, exclusive surfaces (Cockpit, scene playback, recording, clean view), share state and location. The existing gev:* window events feed them. Nothing visible changes.
Rail. The panel store becomes the authority for which panel is open on each side, enforcing one panel per side, and the rail renders from it.
Panels. Each template and its wiring become a component, keeping ids, classes, data-i18n text and CSS. Order: Scenes, Weather, Recent imagery, Street level, CCTV, Layers, Display, Context and Radio, the command dock, the phone shell, then Cockpit. Layers that write into the right rail directly gain a slot instead.
Cleanup. The build-time template expansion and the attribute translation pass are retired once nothing uses them. Hosts register panels and rail items through an explicit API instead of editing markup. Markup-string tests are replaced by component tests.

Verification

Unit tests: stores and components run under npm test. Single-file components are compiled by a test loader; component tests render with @vue/test-utils and happy-dom.
Visual parity: before/after screenshots of every panel at desktop and phone widths, in the default and Cyber themes, with the rail as the only expected difference.
Browser QA: the selector-based scripts/qa-*.mjs suites keep passing.
npm run format:check, npm run check:boundaries, npm run i18n and npm run build.

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