refactor(launcher): remove dead button-list helpers after panel refactor

draw_module_row, tooltip_for, and apply_update were the v0.2.0
button-list rendering helpers. The master-detail panel refactor in
41b28ff moved rendering into panels/list.lua + panels/detail.lua,
leaving these three functions with no call sites. Also drops the
now-unused icons import and ICON_GAP/ICON_STRIP_W constants that only
the deleted helpers referenced; FONT_BUTTON, COLOR_DIM and COLOR_MODAL
stay because the quit-confirm modal still uses them.

Verified by grep that none of the removed symbols have remaining
references in init.lua or sibling files. CI boot is clean:
init ok, modules=6 + BOOTING -> RUNNING -> SHUTTING_DOWN, no FATAL.

init.lua drops 443 -> 302 lines; function count drops 14 -> 11.

init.lua

@@ -1,12 +1,11 @@
 local input = require("lib-core.input")
 local git   = require("lib-core.git")
 local depf  = require("lib-management.dep-fetcher")
--- fsm.lua + icons.lua live in this module's dir; engine_lua_lib's searcher
+-- fsm.lua lives in this module's dir; engine_lua_lib's searcher only
--- only resolves declared lib-deps, so multi-file modules use dofile +
+-- resolves declared lib-deps, so multi-file modules use dofile +
 -- engine.module.dir_of.
 local MODULE_DIR = engine.module.dir_of("lib-management.launcher")
 local fsm   = dofile(MODULE_DIR .. "/fsm.lua")
-local icons = dofile(MODULE_DIR .. "/icons.lua")
 
 local function require_panel(name)
     return dofile(MODULE_DIR .. "/panels/" .. name .. ".lua")
@@ -38,8 +37,6 @@ local FONT_TITLE   = 28
 local FONT_BUTTON  = 20
 local PAD_X        = 16
 local PAD_Y        = 8
-local ICON_GAP     = 4
-local ICON_STRIP_W = 140    -- reserved right-edge area inside each button
 
 local COLOR_BG     = 0x202020FF
 local COLOR_BTN    = 0x404040FF
@@ -142,83 +139,6 @@ local function run_dep_check(m)
     end
 end
 
--- Build the tooltip text for whichever icon the mouse is over.
--- Returns nil when no icon is hovered.
-local function tooltip_for(m, mx, my)
-    local s = m.status
-    if s.error_rect and hit(s.error_rect, mx, my) then
-        local r = s.dep_check_result
-        if r then
-            if #r.conflicts > 0 then
-                local c = r.conflicts[1]
-                return "Pin-Konflikt: " .. c.lib_id
-                       .. " (" .. tostring(#c.pins) .. " Versionen)"
-            elseif #r.errors > 0 then
-                local e = r.errors[1]
-                return "Fehler: " .. e.lib_id .. " — " .. (e.message or e.kind)
-            end
-        end
-        return "Modul nicht startbereit"
-    end
-    if s.badge_rect and hit(s.badge_rect, mx, my) then
-        return "Update verfuegbar: " .. (s.update_latest_tag or "?")
-               .. " — klicken zum Aktualisieren"
-    end
-    if s.warn_rect and hit(s.warn_rect, mx, my) then
-        if s.update_check_result == "fail" then
-            local k = s.update_check_fail_kind
-            if k == "auth-required" then
-                return "Privat — SPOREL_GITEA_TOKEN setzen fuer Update-Check"
-            end
-            return "Updates konnten nicht geprueft werden (" .. (k or "fail") .. ")"
-        end
-        local r = s.dep_check_result
-        if r and #r.warnings > 0 then
-            local w = r.warnings[1]
-            return "Dirty: " .. w.lib_id .. " (" .. (w.kind or "warn") .. ")"
-        end
-        return "Warnung"
-    end
-    if s.local_rect and hit(s.local_rect, mx, my) then
-        return "Nur lokal vorhanden (kein Server-Repo)"
-    end
-    if s.spinner_rect and hit(s.spinner_rect, mx, my) then
-        return "Pruefe auf Updates..."
-    end
-    return nil
-end
-
--- Update flow: fetch + checkout + dep-recheck + kick fresh update-check.
-local function apply_update(m)
-    local url = module_repo_url(m.id)
-    local module_dir = engine.install_root() .. "/modules/" .. m.id
-    if git.is_repo(module_dir) then
-        local ok1, err1 = git.fetch(url, module_dir)
-        if ok1 then
-            local ok2, err2 = git.checkout(module_dir,
-                                           m.status.update_latest_tag)
-            if ok2 then
-                refresh_module_version(m)
-            else
-                engine.print("launcher: checkout failed for " .. m.id
-                             .. ": " .. tostring(err2))
-            end
-        else
-            engine.print("launcher: fetch failed for " .. m.id
-                         .. ": " .. tostring(err1))
-        end
-    else
-        -- Packaged install without .git (cmake --install excludes it).
-        -- Clone-into-temp-and-swap is slice-8 bundle work; for now
-        -- surface a clear log message and let the dep-check error path
-        -- show the user a red icon on next interaction.
-        engine.print("launcher: module " .. m.id
-                     .. " has no .git — update flow requires a dev install")
-    end
-    run_dep_check(m)
-    start_update_check(m)
-end
-
 -- ----- lifecycle -----------------------------------------------------
 
 function init(ctx)
@@ -347,67 +267,6 @@ function update(ctx, dt)
     end
 end
 
-local function draw_module_row(m)
-    local mx, my = engine.input.get_mouse_pos()
-    local color = hit(m.rect, mx, my) and COLOR_HOVER or COLOR_BTN
-    engine.render.draw_rect(m.rect.x, m.rect.y, m.rect.w, m.rect.h, color)
-
-    -- Label left-aligned with PAD_X margin (room reserved on right
-    -- for the icon strip).
-    engine.render.draw_text(m.name, m.rect.x + PAD_X,
-                            m.rect.y + PAD_Y, FONT_BUTTON, COLOR_TEXT)
-
-    -- Icon strip: right-edge anchored, laid out right-to-left so the
-    -- rightmost icon's x stays stable across state changes.
-    local row_y = m.rect.y + (m.rect.h - icons.ICON_H) / 2
-    local right = m.rect.x + m.rect.w - PAD_X - icons.ICON_W
-
-    -- Reset rects each frame so stale hit-areas don't linger when a
-    -- status icon disappears.
-    m.status.spinner_rect = nil
-    m.status.warn_rect    = nil
-    m.status.badge_rect   = nil
-    m.status.error_rect   = nil
-    m.status.local_rect   = nil
-
-    local dep = m.status.dep_check_result
-    local uchk = m.status.update_check_result
-
-    -- 1. Error icon (rightmost) — conflict or error from dep-check.
-    if dep and (not dep.ok) then
-        m.status.error_rect = icons.draw_error(right, row_y)
-        right = right - icons.ICON_W - ICON_GAP
-    end
-
-    -- 2. Update badge — variable width; subtract its returned width.
-    if uchk == "available" and m.status.update_latest_tag then
-        local r = icons.draw_update_badge(
-            right - 40, row_y, m.status.update_latest_tag)
-        m.status.badge_rect = r
-        right = r.x - ICON_GAP - icons.ICON_W
-    end
-
-    -- 3. Warn icon — update-check failed (auth/network) or dirty deps.
-    --    Local-only is NOT a warn — it's an informational state below.
-    local warn_needed = (uchk == "fail")
-        or (dep and dep.ok and dep.warnings and #dep.warnings > 0)
-    if warn_needed then
-        m.status.warn_rect = icons.draw_warn(right, row_y)
-        right = right - icons.ICON_W - ICON_GAP
-    end
-
-    -- 3b. Local-only marker — repo not on server (404 even with creds).
-    if uchk == "local-only" then
-        m.status.local_rect = icons.draw_local(right, row_y)
-        right = right - icons.ICON_W - ICON_GAP
-    end
-
-    -- 4. Spinner — leftmost in the strip, still-pending update-check.
-    if uchk == "pending" then
-        m.status.spinner_rect = icons.draw_spinner(right, row_y, frames)
-    end
-end
-
 function render(ctx)
     local mx, my = engine.input.get_mouse_pos()