feat: add shared Phosphor IconPicker, migrate habits from emoji to icons, add photos upload

- Add curated icon registry (73 Phosphor icons, 8 categories) in shared-icons
- Add DynamicIcon atom and IconPicker molecule in shared-ui
- Migrate habits module from emoji strings to Phosphor icon names
- Add Dexie version(2) migration for emoji→icon field rename
- Replace inline SVGs in habits with Phosphor components
- Add drag-and-drop photo upload to Photos workbench ListView
- Add blob: to CSP img-src for upload previews
- Add dev:media script and include mana-media in dev:manacore:servers
- Add ./toast export to shared-ui package.json

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/shared-ui/package.json

@@ -31,6 +31,11 @@
 			"svelte": "./src/dnd/index.ts",
 			"types": "./src/dnd/index.ts",
 			"default": "./src/dnd/index.ts"
+		},
+		"./toast": {
+			"svelte": "./src/toast/index.ts",
+			"types": "./src/toast/index.ts",
+			"default": "./src/toast/index.ts"
 		}
 	},
 	"scripts": {