Fix resource paths to use relative ./ instead of absolute /

[Copilot]

When deployed at a sub-path (e.g. domain.com/mini-qr/), all asset references broke because the default Vite base was /, generating absolute paths like /assets/index.js that assume domain-root deployment.

Changes

• vite.config.js: Default base changed from '/' → './'; simplified trailing-slash guard by removing redundant base !== '/' check
• index.html: Static favicon/apple-touch-icon hrefs changed from /favicon.svg → ./favicon.svg etc.
• src/utils/basePath.ts: Runtime fallback default updated from '/' → './'
• .env.example: Updated comment to reflect new default

Before → After (built index.html)

-<script type="module" crossorigin src="/assets/index-abc123.js"></script>
-<link rel="stylesheet" href="/assets/index-abc123.css">
+<script type="module" crossorigin src="./assets/index-abc123.js"></script>
+<link rel="stylesheet" href="./assets/index-abc123.css">

With BASE_PATH explicitly set (e.g. /mini-qr), behavior is unchanged.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
mini-qr	Ready	Preview, Comment	Mar 31, 2026 0:43am