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feat: add PWA support with Android share intent

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Make Favoritter installable as a Progressive Web App with offline
static asset caching and Web Share Target API for Android.

New files:
- internal/handler/pwa.go: handlers for manifest, service worker,
  and share target
- web/static/sw.js: service worker (cache-first static, network-first
  HTML) with {{BASE_PATH}} placeholder for subpath deployments
- web/static/icons/: placeholder PWA icons (192, 512, 512-maskable)

Key design decisions:
- Share target uses GET (not POST) to avoid CSRF token issues — Android
  apps cannot provide CSRF tokens
- Manifest is generated dynamically to inject BasePath into start_url,
  scope, icon paths, and share_target action
- Service worker served at /sw.js with Cache-Control: no-cache and
  BasePath injected via string replacement
- handleShare extracts URLs from Android's "text" field as fallback
  (many apps put the URL there instead of "url")
- handleFaveNew replaced with handleFaveNewPreFill that reads url,
  description, notes from query params (enables share + bookmarklets)
- SW registration in app.js reads base-path from <meta> tag (CSP-safe)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Ole-Morten Duesund 2026-04-07 10:06:18 +02:00
commit 1260cfd18f
10 changed files with 375 additions and 14 deletions
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5
web/templates/layouts/base.html
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@ -6,6 +6,11 @@
<title>{{if .Title}}{{.Title}} — {{end}}{{.SiteName}}</title>
<link rel="stylesheet" href="{{basePath}}/static/vendor/pico.min.css">
<link rel="stylesheet" href="{{basePath}}/static/css/style.css">
<meta name="theme-color" content="#1095c1">
<link rel="manifest" href="{{basePath}}/manifest.json">
<link rel="icon" type="image/png" sizes="192x192" href="{{basePath}}/static/icons/icon-192.png">
<link rel="apple-touch-icon" href="{{basePath}}/static/icons/icon-192.png">
<meta name="base-path" content="{{basePath}}">
{{block "head" .}}{{end}}
</head>
<body>