Improve gallery video UX and add upload-to-publish media workflow.

Stage raw files in upload/, publish with make sync-media/publish, and polish the lightbox: autoplay, remembered volume, Escape to close, and image/video icons without poster or caption clutter.

Co-authored-by: Cursor <cursoragent@cursor.com>

Makefile

@@ -6,9 +6,9 @@ export GOMODCACHE ?= $(HOME)/go/pkg/mod
 export GOCACHE ?= $(HOME)/.cache/go-build
 
 # One-off commands in the dev image (same caches and ./app mount as `make dev`)
-DEV_RUN := $(COMPOSE) run --rm --no-deps dev
+DEV_RUN := $(COMPOSE) run --rm --no-deps -T dev
 
-.PHONY: dev build up down generate tidy logs
+.PHONY: dev build up down generate tidy logs thumbs sync-media publish convert-videos
 
 .DEFAULT_GOAL := dev
 
@@ -34,3 +34,17 @@ tidy:
 
 logs:
 	$(COMPOSE) logs -f dev
+
+# Pre-build gallery thumbnails and video poster JPEGs (ffmpeg in dev image).
+thumbs:
+	$(DEV_RUN) go run ./cmd/server -thumbs
+
+# Copy photos and convert videos from upload/ into app/images/.
+sync-media:
+	$(DEV_RUN) sh -c 'UPLOAD_DIR=/upload IMAGES_DIR=/app/images ./scripts/sync-media.sh $(ARGS)'
+
+# sync-media then rebuild thumbs/hero derivatives under app/images/.
+publish: sync-media thumbs
+
+# Alias for sync-media (videos are converted as part of sync).
+convert-videos: sync-media