update icon and template handling

CLAUDE.md

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+# CLAUDE.md
+
+## Project Overview
+
+`datascape` is a minimal personal wiki where **the folder structure is the wiki**.
+No database, no CMS, no abstraction layer — every folder is a page, and `index.md`
+in a folder is that page's content.
+
+## Build & Deploy
+
+```bash
+# Local build (host architecture)
+go build .
+
+# Deploy to NAS
+make deploy
+```
+
+## HTTP API Surface
+
+| Method | Path | Behaviour |
+|--------|------|-----------|
+| GET | `/{path}/` | If folder exists: render `index.md` + list contents. If not: show empty create prompt. |
+| GET | `/{path}/?edit` | Mobile-friendly editor with `index.md` content in a textarea |
+| POST | `/{path}` | Write `index.md` to disk; creates the folder if it does not exist yet |
+
+Non-existent paths without a trailing slash redirect to the slash form (GET only — POSTs
+are not redirected because `path.Clean` strips the trailing slash from `PostURL` and the
+content would be lost).
+
+Do not add new endpoints without a concrete stated need.
+
+## Code Structure
+
+When adding a new special folder type, create a new `.go` file. Do not add type-specific logic to `main.go` or `render.go`.
+
+Prefer separate, human-readable `.html` files over inlined HTML strings in Go. Embed them via `embed.FS` if needed.
+
+
+## Architecture Rules
+
+- **Single binary** — no installer, no runtime dependencies, no Docker
+- **Go stdlib `net/http`** only — no web framework
+- **`goldmark`** for Markdown rendering — no other Markdown libraries
+- **`embed.FS`** for all assets — no external serving, no CDN
+- **No database** of any kind
+- **No indexing or caching** unless explicitly requested and justified
+- Keep dependencies to an absolute minimum; if stdlib can do it, use stdlib
+
+## Frontend Rules
+
+- Vanilla JS only — no frameworks, no build pipeline
+- Each feature gets its own JS file; global behaviour goes in `global-shortcuts.js`
+- Do not inline JS in templates or merge unrelated features into one file
+- `ALT+SHIFT` is the modifier for all keyboard shortcuts — do not introduce others
+- Editor toolbar buttons use `data-action` + `data-key`; adding `data-key` auto-registers the shortcut
+
+## Development Priorities
+
+When building features, apply this order:
+1. Correctness on the filesystem — never corrupt or lose files
+2. Mobile usability (primary editing device is Android over Wireguard VPN)
+3. Simplicity of implementation, adhere to KISS
+4. Performance
+
+## What to Avoid
+
+- Any parallel folder structure (e.g. a separate `media/` tree mirroring `pages/`)
+- Over-engineering auth — Basic auth is sufficient for a personal VPN tool
+- Heavy payloads or expensive rendering (target CPU: ARMv7 32-bit NAS)
+- Suggesting Docker (plain binary is preferred)
+
+## Out of Scope (do not implement unless explicitly asked)
+
+- Full-text search
+- Browser-based file upload
+- Version history / git integration
+- Multi-user support
+- Tagging or metadata beyond `index.md` content