feat(i18n): presentation extraction — t() call sites, data-i18n templates, locale selector

Route every application-owned presentation string through the i18n
core: t() call sites across the app/layers/ui/data/voice surfaces,
data-i18n* attributes in the src/ui/templates/*.html markup (applied at
boot by applyDocumentTranslations from src/standalone/application.js),
and the dock locale selector (runtime-rendered from the offered pair —
a single EN button while only English ships).

Rebased onto current main, where the extraction follows the module
splits: the shell wiring now lands in the owner modules
(panelChrome, visualSettings, locationNavigation, shareRestoration,
shellFeedback, applicationShell) and the voice status corpus in the
realtime* modules; scene status lives in director.js +
playbackAdapter.js.

Modules shared with the node runtime (loadingFeedback,
installationFeedback, regionalModel, keySetupCore, vessels ingestion)
stay environment-neutral English and localize at their browser render
sites (chip maps in shellFeedback/installations controls, the weather
table in cockpitBriefing, keySetupRequirementEnvVars compositions), so
the package-boundary graph stays clean; the browser boundary groups
now own the i18n modules they reach (scripts/package-boundaries.json).

src/ui/templates/welcome.html

@@ -5,9 +5,9 @@
   <aside id="first-run-launcher" role="dialog" aria-labelledby="first-run-title" aria-describedby="first-run-description" hidden>
     <div class="first-run-scanline" aria-hidden="true"></div>
     <header class="first-run-header">
-      <span class="first-run-kicker">MISSION CONTROL · FIRST LAUNCH</span>
+      <span class="first-run-kicker"  data-i18n="setup.firstRun.kicker">MISSION CONTROL · FIRST LAUNCH</span>
     </header>
-    <h2 id="first-run-title">Choose your first view</h2>
+    <h2 id="first-run-title"  data-i18n="setup.firstRun.title">Choose your first view</h2>
     <!-- The card's one persuasive line, owner-authored and VERBATIM (2026-08-23)
          — including the unspaced em dash. The arc it has to carry: this looks
          like something you should not have access to → the sources are all
@@ -16,12 +16,12 @@
     <div class="first-run-choices">
       <button type="button" data-first-run-choice="contacts">
         <span class="material-symbols-outlined" aria-hidden="true">radar</span>
-        <span><strong>LIVE CONTACTS</strong><small>Aircraft, vessels and nearby intelligence</small></span>
+        <span><strong data-i18n="setup.firstRun.choice.contacts">LIVE CONTACTS</strong><small data-i18n="setup.firstRun.choice.contactsSub">Aircraft, vessels and nearby intelligence</small></span>
         <span class="material-symbols-outlined first-run-arrow" aria-hidden="true">arrow_forward</span>
       </button>
       <button type="button" data-first-run-choice="space-missions">
         <span class="material-symbols-outlined" aria-hidden="true">rocket_launch</span>
-        <span><strong>SPACE MISSIONS</strong><small>Launches, spacecraft and orbital context</small></span>
+        <span><strong data-i18n="setup.firstRun.choice.spaceMissions">SPACE MISSIONS</strong><small data-i18n="setup.firstRun.choice.spaceMissionsSub">Launches, spacecraft and orbital context</small></span>
         <span class="material-symbols-outlined first-run-arrow" aria-hidden="true">arrow_forward</span>
       </button>
       <button type="button" data-first-run-choice="environmental">
@@ -35,18 +35,18 @@
       </button>
       <button type="button" class="first-run-explore" data-first-run-choice="explore">
         <span class="material-symbols-outlined" aria-hidden="true">public</span>
-        <span><strong>EXPLORE MANUALLY</strong><small>Begin with a clean globe</small></span>
+        <span  data-i18n="setup.firstRun.choice.explore"  data-i18n="setup.firstRun.choice.exploreSub"><strong>EXPLORE MANUALLY</strong><small>Begin with a clean globe</small></span>
         <span class="material-symbols-outlined first-run-arrow" aria-hidden="true">arrow_forward</span>
       </button>
     </div>
     <div class="first-run-footer">
       <label class="first-run-suppress">
         <input type="checkbox" data-first-run-suppress />
-        <span>Don't show this again</span>
+        <span  data-i18n="setup.firstRun.suppress">Don't show this again</span>
       </label>
-      <span>ESC to dismiss</span>
+      <span  data-i18n="setup.firstRun.dismissHint">ESC to dismiss</span>
     </div>
     <!-- Kept out of the footer row: it swaps to mission progress and errors, and
          a live region that also holds layout makes the row jump as it speaks. -->
-    <p class="first-run-note" data-first-run-status role="status" aria-live="polite">Tip: the GEV MIC button in the dock lets you talk to the map.</p>
+    <p class="first-run-note" data-first-run-status role="status" aria-live="polite"  data-i18n="setup.firstRun.note">Tip: the GEV MIC button in the dock lets you talk to the map.</p>
   </aside>