fix(launcher): wire FSM dispatch + correct conflict-count

The conflict-modal path bypassed the FSM extension landed in L.7:
panels/detail.lua set ctx.modal_open directly and init.lua drove
modal handling off the side-channel field, so STATE_MODAL_CONFLICT
was unreachable at runtime (only the test-lib asserts exercised it).
Now detail.lua marks ctx._pending_modal_open and init.lua dispatches
the open_conflict event so state actually transitions through the
fsm. Modal entry/exit is gated on state == STATE_MODAL_CONFLICT.

Also fixes the conflict body line: r.missing doesn't exist on the
dep-fetcher result; use #(errors) + #(conflicts) for the count
displayed in the modal body.

init.lua

@@ -207,7 +207,6 @@ function init(ctx)
         bg_texture         = nil,      -- L.10 loads it
         default_teaser_texture = nil,  -- L.10 loads it
         t                  = function(k) return k end,  -- L.8 swaps in real t()
-        modal_open         = nil,      -- L.7 sets to "quit" | "conflict"
         carousel_state     = {},       -- per-module-id state, L.5 populates
         manifest_cache     = {},       -- L.3 populates
         launcher_dir       = MODULE_DIR, -- L.4: detail.lua dofiles markdown.lua via this
@@ -340,22 +339,31 @@ function update(ctx, dt)
 
     local mx, my = engine.input.get_mouse_pos()
 
+    -- C1: detail.lua's launch-button branch signals a conflict via
+    -- ctx._pending_modal_open; dispatch the FSM event here so state
+    -- actually transitions into STATE_MODAL_CONFLICT before the modal
+    -- branch below runs.
+    if ctx_panels._pending_modal_open == "conflict" then
+        state = fsm.next(state, "open_conflict")
+        ctx_panels._pending_modal_open = nil
+    end
+
     -- L.7: Conflict-modal takes priority over STATE_LIST input. esc /
     -- Cancel close the modal back to STATE_LIST; "Launch anyway" stays
     -- a no-op until engine.module.switch_module_supports_fallback ships.
-    if ctx_panels.modal_open == "conflict" then
+    if state == fsm.STATE_MODAL_CONFLICT then
         if input.was_action_pressed("ui_back") then
-            ctx_panels.modal_open = nil
             state = fsm.next(state, "esc")
+            ctx_panels.modal_def = nil
         elseif input.was_action_pressed("ui_click") then
             local id = modal_panel.handle_click(ctx_panels.modal_def, mx, my)
             if id == "cancel" then
-                ctx_panels.modal_open = nil
                 state = fsm.next(state, "cancel")
+                ctx_panels.modal_def = nil
             elseif id == "launch_anyway" then
                 local mid = ctx_panels.modal_def.module_id
-                ctx_panels.modal_open = nil
                 state = fsm.next(state, "launch_anyway")
+                ctx_panels.modal_def = nil
                 if engine.module.switch_module_supports_fallback then
                     engine.switch_module(mid, { mode = "fallback" })
                 end
@@ -396,7 +404,7 @@ function render(ctx)
     detail_panel.render(ctx_panels)
 
     -- L.7: Conflict modal renders above the panels (backdrop dims them).
-    if ctx_panels.modal_open == "conflict" then
+    if state == fsm.STATE_MODAL_CONFLICT then
         modal_panel.render(ctx_panels.modal_def, screen_w, screen_h)
     end