fix(launcher): localize image-missing placeholder + drop dead icons.lua

- markdown.lua: M.render now accepts an optional `t` 6th arg (ctx.t).
  When present, the image-missing fallback string is looked up via the
  new `image_missing_fmt` key in strings.lua. Callers without t (the
  launcher-test bytecopy) get the hardcoded English string verbatim,
  matching previous behavior.
- panels/detail.lua: both md.render call sites now thread ctx.t through.
- strings.lua: add image_missing_fmt = "[image missing: %s]".
- icons.lua: deleted. The v0.2.0 status-glyph helper was replaced by
  dep_glyph_* string keys in v0.3.0; grep confirmed no remaining refs.
- manifest.module: bump 0.3.2 -> 0.3.3.

markdown.lua

@@ -176,7 +176,11 @@ local function render_spans(spans, x, y, max_w, size)
     return cur_y + line_h
 end
 
-function M.render(blocks, x, y, max_w, module_id_for_imgs)
+-- `t` (optional, 6th arg) is the launcher's ctx.t string-lookup function.
+-- When present, M.render uses it to localize the image-missing placeholder
+-- via the `image_missing_fmt` key. Callers that don't have a t (e.g. tests)
+-- may pass nil; the hardcoded English fallback then renders verbatim.
+function M.render(blocks, x, y, max_w, module_id_for_imgs, t)
     local cur_y = y
     for _, b in ipairs(blocks) do
         if b.type == "h1" then
@@ -216,7 +220,9 @@ function M.render(blocks, x, y, max_w, module_id_for_imgs)
                     -- assume a 16:9 max_w-wide image for layout.
                     cur_y = cur_y + math.floor(max_w * 9 / 16) + PARA_GAP
                 else
-                    engine.render.draw_text("[image missing: " .. b.src .. "]",
+                    local missing_text = t and t("image_missing_fmt", b.src)
+                                            or ("[image missing: " .. b.src .. "]")
+                    engine.render.draw_text(missing_text,
                                             x, cur_y, BODY_SIZE, COLOR_DIM)
                     local _, h = engine.render.measure_text("[image]", BODY_SIZE)
                     cur_y = cur_y + h + PARA_GAP