feat: make browse grid 6 columns and full-width

- Grid layout set to repeat(6, 1fr) with responsive breakpoints for smaller screens
- Removed layout max-width constraint on browse page via :global(main) override
- Header and pagination get their own padding within the full-width layout
- Increased per page to 60 for better coverage at 6 columns

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feat: redesign browse grid with Chevereto-style card layout and hover overlay

- Compact grid with 2px gaps and dark image backgrounds (aspect-ratio 16:10)
- Image fills card via object-fit: cover with subtle scale-on-hover
- Gradient overlay on hover shows filename, dimensions, and truncated tags
- Removed rounded corners and info text below cards for cleaner look

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Assisted-by: Crush:deepseek-reasoner

feat: add image overlay viewer with keyboard navigation and idle UI fade

Replaces full-page navigation with a Chevereto-inspired lightbox overlay
when clicking thumbnails in the browse grid. Supports prev/next via
buttons and arrow keys, close via Esc/click-outside, auto-hiding controls
after 3s of inactivity, and a bottom info bar with metadata and download.

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fix: preserve all tags on upload and return empty array on no match

Tags beyond the first were silently dropped because `r.FormValue("tags")`
returns only the first value when the frontend sends each tag as a
separate FormData field. Changed to `r.Form["tags"]`.

Nil slices in API responses (`var images []Image`) marshalled to JSON
`null`, causing a TypeError in the Svelte template (`null.length`),
making "Loading..." persist forever. Initialized all API-facing slices
with `make()` so they marshal as `[]`.

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Assisted-by: Crush:deepseek-reasoner

feat: implement core backend API and SvelteKit SPA

Full MVP implementation of the weimar media repository:
- CLI commands for user CRUD, image deletion, password reset
- HTTP API with auth (cookie sessions), upload, browse, download,
  thumbnail serving, and tag autocomplete
- SQLite-backed storage with migrations
- Hash-partitioned disk storage with EXIF stripping and thumbnails
- SvelteKit SPA with login, upload, browse grid, and image detail pages
- Makefile build flow: SvelteKit build -> Go embed -> single binary

feat: initial project scaffolding

Single-binary media repository for home servers — Go backend with
embedded SvelteKit SPA.

- Cobra CLI with viper config (TOML, env vars WEIMAR_*, flags)
- Commands: serve, users, image, version
- HTTP server with Go 1.22+ ServeMux, API route stubs, SPA fallback
- SvelteKit frontend with adapter-static (SPA mode, 5 routes)
- Build pipeline: Makefile, GoReleaser, UPX compression
- ldflags-based version and build date injection

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Assisted-by: Crush:deepseek-reasoner