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fix(filters): support Buffer input in base64_encode to prevent binary data corruption (#881)

* fix: support Buffer input in base64_encode filter

When binary data (e.g. images, PDFs) is passed through the template
context as a Node.js Buffer, the base64_encode filter would call
stringify() on it first, which internally does String(value). This
triggers Buffer.toString() with the default 'utf-8' encoding, which
is a lossy conversion for non-UTF-8 byte sequences — invalid bytes
get replaced with U+FFFD, permanently destroying the original data.

The fix checks for Buffer.isBuffer() before stringify, and calls
buffer.toString('base64') directly, bypassing the lossy UTF-8
intermediate step. String inputs continue through the existing path
unchanged.

Made-with: Cursor

* fix: handle Buffer in filter layer to fix browser build

Move Buffer handling from base64-impl.ts (which gets swapped for the
browser impl at build time) into base64.ts (the filter layer). This
avoids a type error during the browser rollup build where the browser
impl only accepts string.

Also guard Buffer.isBuffer() with typeof Buffer !== 'undefined' for
safety in browser environments.

Made-with: Cursor

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