import as type and use named imports when possible

[schlawg]

• FEN, Role, Key, Dests, Piece, Color, Files, Ranks from chessground/types provided in global namespace via @types/lichess
• chessops dependency hoisted to main package.json
• chessops no longer loaded by all pages - instead confined to analysis, puzzles, some others
• use import type whenever possible
• prefer named imports unless benefits of secondary scoping are clear

it's never a bad idea to always import types like { type MyType } and prefer named imports as sometimes it can avoid including unnecessary code, although this is far less important now with code splitting.

this PR does reduce the overall assets downloaded on most pages (slightly). that's a consequence of reduced bundling due to import changes. it has some insignificant edits to speech/voice but aside from that, javascript should be the same. only types and names were changed - it's much safer than it probably looks.