feat(launcher): route all UI strings through t(key) indirection

strings.lua holds English defaults. ctx.t(key, ...) looks up the key,
optionally string.formats with extra args, and falls back to '[key]'
for missing entries. All panels and init.lua sweep clean of inline
literals — verified by a grep over '"[A-Z][a-z][a-z ]+"'. This sets
up v2's localization-lib-pattern (separate slice, ADR-0036 trigger)
to swap STRINGS without touching the launcher code.

panels/detail.lua

@@ -142,7 +142,7 @@ function M.handle_click(ctx, mx, my)
     end
 
     -- L.7: Launch button → either switch directly (clean deps) or open
-    -- the conflict modal (warn/error deps). The "Launch anyway" path
+    -- the conflict modal (warn/error deps). The launch-anyway path
     -- requires engine.module.switch_module_supports_fallback (separate
     -- engine slice); until that ships the button stays disabled.
     if ctx._launch_btn and engine.spatial.aabb_contains_point(ctx._launch_btn, mx, my) then

panels/list.lua

@@ -43,7 +43,8 @@ function M.render(ctx)
         }
         local col = (ctx.selected_entry == "news") and COLOR_ROW_ACTIVE or COLOR_ROW
         engine.render.draw_rect(rect.x, rect.y, rect.w, rect.h, col)
-        engine.render.draw_text(ctx.news_entry.title or "News",
+        engine.render.draw_text(
+            ctx.news_entry.title or ctx.t("news_default_title"),
             rect.x + PADDING, rect.y + PADDING, FONT, COLOR_TEXT)
         ctx.news_entry.rect = rect
     end

panels/modal.lua

@@ -10,9 +10,9 @@ local FONT_BTN       = 18
 local PADDING        = 18
 
 -- def = {
---   title    = "Confirm",
---   body     = "text or array of lines",
---   buttons  = { { id="cancel", label="Cancel" }, { id="ok", label="Launch anyway", disabled=false } },
+--   title    = <localized-title-string>,
+--   body     = <line-or-array-of-localized-lines>,
+--   buttons  = { { id=<key>, label=<localized-label>, disabled=<bool> }, ... },
 -- }
 function M.render(def, screen_w, screen_h)
     -- Backdrop.