restore content editor launcher entrypoint

docs/refactor/arc-1-smoke-checklist.md

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+# Arc 1 Smoke Checklist
+
+This checklist is the manual checkpoint for Arc 1.
+
+It is intentionally short and focused on the editor flows that must remain usable while the refactor branch is in motion.
+
+## Preconditions
+
+- start the Vite client with `npm run dev`
+- start the API server with `npm run dev:api`
+- open the launcher at the local dev URL
+
+## Checklist
+
+### 1. Launcher Opens
+
+- verify the launcher renders
+- verify the primary launch actions are visible
+- verify the `Content Editor` action is available
+
+### 2. Content Editor Loads
+
+- open the content editor from the launcher
+- verify the content editor window loads
+- verify the main content domains are listed:
+  - NPCs
+  - Dialogues
+  - Monsters
+  - Items
+  - Abilities
+  - Loot Tables
+  - Quests
+  - Graphics
+  - Factions
+
+### 3. Content Record Edit Round Trip
+
+- open any existing content record
+- change one small field value
+- use `Commit`
+- use `Save`
+- verify the save status updates
+- revert the field to its original value
+- save again so the repository returns to its original content state
+
+### 4. Studio Window Opens
+
+- open the studio from the launcher
+- verify the studio bootstraps into a world without console-blocking errors
+
+### 5. World Loads And A Tile Edit Still Works
+
+- verify the current world name and dimensions are visible
+- select a tile
+- paint one tile on the map
+- verify undo/save state updates
+- save the world
+- revert the tile change before finishing the checkpoint
+
+### 6. Graphics Painter Opens And Saves
+
+- open the graphics browser from the studio
+- open a sprite or tile asset in the painter
+- change one pixel
+- save the asset
+- revert the pixel change before finishing the checkpoint
+
+## Verification Notes
+
+Checkpoint commits for Arc 1 should only be considered shareable when:
+
+- `npm test` passes
+- `npm run build` passes
+- this checklist passes
+- temporary smoke-test content edits have been reverted before commit