Remove auto new tab for external links

CLAUDE.md

@@ -5,143 +5,3 @@ I want to understand every line of code that goes into this project. Never creat
 Do not run commands that modify project files, install dependencies, or change repository state unless I explicitly request that action. Instead, show me those commands in the chat so I can run them manually.
 
 I'm an experienced developer. Do not explain syntax, APIs, programming concepts, or implementation details unless explicitly asked.
-
-## 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
-```
-
-### Editor bundle (the one build-pipeline exception)
-
-The page editor uses CodeMirror 6, vendored as a single pre-built IIFE at
-`assets/editor/vendor/codemirror.bundle.js` and embedded via `embed.FS`. This is
-the **only** deliberate exception to the "no build pipeline" rule below — it is a
-one-time, committed artifact, not a runtime build. `go build` / `make deploy`
-never touch Node and only consume the committed bundle.
-
-Regenerate the bundle **only** when upgrading the `@codemirror/*` versions:
-
-```bash
-# bump versions in editor-build/package.json first, then:
-make editor          # runs `npm ci && npm run build` in editor-build/, rewrites the vendored bundle
-```
-
-Commit the regenerated `codemirror.bundle.js` and the updated
-`editor-build/package-lock.json`. `editor-build/node_modules/` is gitignored.
-
-The bundle is served immutable under a stable filename, so the edit template
-appends `?v=<content-hash>` to its `<script>` src (`editorBundleVersion` in
-`main.go`). The hash changes whenever the bundle bytes change, so a rebuilt
-bundle busts client caches automatically — no manual version bump needed.
-
-## 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` | CodeMirror 6 editor initialized with `index.md` content |
-| 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).
-
-## 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 (the single exception is the vendored CodeMirror editor bundle; see Build & Deploy)
-- 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
-- The editor is a *mode* of a page. Opening it pushes a normal history entry so
-  the browser/Android Back button cancels the edit and returns to the page — this
-  "back to cancel" gesture takes priority. `history-nav.js` only rewrites the way
-  *out*: leaving the editor via the same-page CANCEL link uses `location.replace`
-  so the editor entry is collapsed rather than sandwiched between two page entries
-  (which would let Back walk back into the editor). SAVE does the equivalent — it
-  POSTs via fetch and then `replaceState`s the editor entry with the saved page,
-  so the editor never lingers in history once you leave it (the pre-save page
-  snapshot one step back is the accepted cost). Links to a *different* page's
-  editor (new page / new child) push normally. The save POST answers `204` +
-  `X-Target` when the request carries `X-Save-Mode: replace`, because the target
-  may hold a `#section` anchor only the server can compute and fetch drops
-  fragments from followed redirects.
-- For mutating modals (anything that POSTs and then navigates), call `closeModal()` and then `postReplace(action, body, target)` from `page/actions.js`. Do NOT use `<form>.submit()`. Two reasons:
-  1. The modal must be removed from the DOM before navigation, or the browser's bfcache snapshots it open and back-nav restores the modal.
-  2. `postReplace` uses `window.location.replace` so the action + result occupy a single history entry. A naive POST → 303 → GET creates two entries, and back-nav lands on a stale pre-mutation snapshot of the same page.
-
-## CSS
-
-Follow **SMACSS** conventions (Scalable and Modular Architecture for CSS). The stylesheet is organized into five categories:
-
-- **Base** — element resets and global defaults only. Never style `header`, `textarea`, `input`, `aside`, `footer`, etc. directly for visual treatment — always via a class.
-- **Layout** — `.row`, `.col`, `.page-wrap`. Use these for flex layout; do not inline `display: flex` on feature classes.
-- **Modules** — reusable components: `.panel`, `.panel-header`, `.menu-row`, `.btn`, `.input`, `.muted`, `.truncate`, etc. New visual patterns should reuse these. Before adding a new module, check whether an existing one + a modifier already covers the case.
-- **State** — `.is-*` prefix only (`.is-open`, `.is-selected`, `.is-active`, `.is-disabled`, `.is-empty`). State is the only place a class describes a moment in time rather than a structural role.
-- **Theme** — colors, borders, spacing, and font sizes come from CSS variables defined in `:root` (`--bg`, `--secondary`, `--border`, `--border-dashed`, `--space-*`, `--font-*`). No hardcoded `1px solid #...`, no hardcoded rem spacing in component rules.
-
-Naming: flat-dash (`.panel-header`, `.btn-small`), not BEM (`.panel__header--small`). Modifiers attach as additional classes (`<div class="btn btn-small">`), not as new standalone classes.
-
-Anti-patterns to reject:
-- One-off classes that duplicate an existing module (`.save-button` when `.btn` exists, `.form-name-input` when `.input` exists).
-- Element selectors (`textarea { ... }`, `header { ... }`) for visual treatment — add a class instead.
-- Inlining `display: flex; gap: X` on a feature class instead of composing with `.row` / `.col`.
-- Adding a new module for a single use site — prefer a modifier on an existing module first.
-- Hardcoded colors, border widths, or spacing values inside component rules — pull a variable, or add one to `:root` if it's missing.
-
-## 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
-
-## Date Formatting
-
-- General UI dates (file listings, metadata): ISO `YYYY-MM-DD`
-- Diary headings (year/month/day) are also ISO short form: `# 2026`, `## 2026-05`, `### 2026-05-28`. No long-form rendering.
-- Calendar widget month names are German; the `germanMonths` map in `diary.go` keeps the labels keyed by `time.Month` since Go's `time.Format` is English-only.
-
-## 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

extlinks.go

@@ -1,57 +0,0 @@
-package main
-
-import (
-	"strings"
-
-	"github.com/yuin/goldmark"
-	"github.com/yuin/goldmark/ast"
-	"github.com/yuin/goldmark/parser"
-	"github.com/yuin/goldmark/text"
-	"github.com/yuin/goldmark/util"
-)
-
-type extLinksTransformer struct{}
-
-func (extLinksTransformer) Transform(doc *ast.Document, reader text.Reader, pc parser.Context) {
-	ast.Walk(doc, func(n ast.Node, entering bool) (ast.WalkStatus, error) {
-		if !entering {
-			return ast.WalkContinue, nil
-		}
-		link, ok := n.(*ast.Link)
-		if !ok {
-			return ast.WalkContinue, nil
-		}
-		if isExternalURL(string(link.Destination)) {
-			link.SetAttribute([]byte("target"), []byte("_blank"))
-			link.SetAttribute([]byte("rel"), []byte("noopener noreferrer"))
-		}
-		return ast.WalkContinue, nil
-	})
-}
-
-func isExternalURL(dest string) bool {
-	if strings.HasPrefix(dest, "//") {
-		return true
-	}
-	i := strings.Index(dest, ":")
-	if i <= 0 {
-		return false
-	}
-	for _, c := range dest[:i] {
-		if !(c >= 'a' && c <= 'z') && !(c >= 'A' && c <= 'Z') &&
-			!(c >= '0' && c <= '9') && c != '+' && c != '-' && c != '.' {
-			return false
-		}
-	}
-	return true
-}
-
-type extLinksExt struct{}
-
-func newExtLinksExt() goldmark.Extender { return &extLinksExt{} }
-
-func (e *extLinksExt) Extend(m goldmark.Markdown) {
-	m.Parser().AddOptions(parser.WithASTTransformers(
-		util.Prioritized(extLinksTransformer{}, 999),
-	))
-}

render.go

@@ -24,7 +24,7 @@ var md goldmark.Markdown
 // targets against the filesystem.
 func initMarkdown(root string) {
 	md = goldmark.New(
-		goldmark.WithExtensions(extension.GFM, extension.Table, newWikiLinkExt(root), newWikiEmbedExt(root), newExtLinksExt()),
+		goldmark.WithExtensions(extension.GFM, extension.Table, newWikiLinkExt(root), newWikiEmbedExt(root)),
 		goldmark.WithParserOptions(parser.WithAutoHeadingID()),
 		goldmark.WithRendererOptions(html.WithUnsafe(), html.WithHardWraps()),
 	)