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* fix(ai): validate large base64 without anchored regexp loops
Gemini TTS replies over ~4 MB of base64 (~65 s of audio) failed with
"Maximum call stack size exceeded". Once a process holds enough compiled
code, V8 compiles new regexps unoptimized, and `^[...]+={0,2}$` then
pushes a backtrack entry per character until its stack overflows.
TTS now searches for a character outside the alphabet instead. The raw
base64 icon/reference-image check drops its own anchored regexp;
decodeStrictBase64 already rejects the same inputs.
* perf(ai): validate base64 by decoded length instead of regexp passes
Unoptimized regexp scans dominated large payloads: 186 ms for max-length
TTS audio, 880 ms in decodeStrictBase64 for 30 MB of video. Buffer.from
skips characters outside the alphabet, so comparing the decoded length
with the one the input length predicts catches them for free.
decodeStrictBase64 now does that plus rejecting the URL-safe alphabet
(~10 ms for 30 MB), and TTS reuses it instead of its own check.
Non-canonical trailing bits now decode instead of being rejected.
* fix(ai): reject non-ASCII base64 that Node decodes by its low byte
Node reads code units above 0xFF by their low byte, so U+012B decodes
as '+' and keeps the decoded length the input predicts. Require ASCII
(~1-2 ms for 43M chars) before the length check.