Guarded .env.local write-back + structured project editor

[terminalis]

What

This branch adds two app capabilities and finishes with a site/brand polish.

Guarded write-back to .env*.local (src-tauri, ui)

Hand values back out to a .env*.local file the user explicitly chooses — merge into an existing file or write fresh — or scaffold one from a .env.example. The write is guarded: it only ever targets a .env*.local (never a committed example file). New backend modules envfile.rs and envpath.rs handle parsing and path validation; surfaced through commands.rs / api.js.

Build or edit a project by hand (ui)

A structured editor to create or edit a project key by key — with or without an .env file — including KEY=value rows with an export toggle, comments, and seeding from a .env.example. Nothing is written to disk unless the user chooses to. Includes selftest.js and mock.js coverage.

Docs + site

• README.md and index.html document the .env.local write, scaffold, and editor.
• Refreshed the gallery screenshots and alt text. Two shots changed identity: screenshot 03 is now the "New project by hand" dialog (was Settings) and 04 is now Settings (was "Export a copy"). Alt text and captions were rewritten to match; 01/02 were unchanged. All four remain 1122×751.
• Replaced the demo-screenshot OG image with a purpose-built 1200×630 brand card at brand/og-image.png, generated by a new tools/make-og.ps1 (a sibling of tools/make-icon.ps1, same System.Drawing approach + vault-dark palette + key-bar/masked-dots motif). og:image / twitter:image repointed, dimensions updated to 1200×630, and og:image:alt rewritten. demo.png stays in use by the README and the JSON-LD screenshot list.

Notes for reviewers

• The write-back invariant is the security-sensitive part: confirm it can only target .env*.local and never an example/committed file. See envpath.rs and the write path in commands.rs.
• brand/ is git-tracked and served at the GitHub Pages root, so https://envarsa.dev/brand/og-image.png resolves once deployed.
• Regenerate the OG card any time with powershell -File tools\make-og.ps1.

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