chore: prepare release v1.8.2

[PiTrem]

Patch release covering the four commits on master since v1.8.1.

Contents

• fix(lcms): retention time normalized to minutes, UV/TIC pane domains aligned (fix(lcms): normalize TIC x to minutes and align UV/TIC pane domains #323)
• fix(lcms): a UV/VIS axis arriving in seconds behind a MINUTES label is corrected (fix(lcms): correct a UV/VIS axis that arrives in seconds behind a MINUTES label #326)
• fix(lcms): the three-graph stack, toolbar and panel fit their container (fix(lcms): fit the three-graph stack, toolbar and panel to their container #325)
• fix(cv): an incomplete feature no longer takes the whole editor down (fix(cv): stop an incomplete feature taking the whole editor down #327)

Commits

1. chore: Bump version from 1.8.1 to 1.8.2 — package.json only
2. docs: add CHANGELOG for 1.8.2 — newest entry on top

No build: recompile dist commit this time: a clean rebuild in node:22.23.1
(yarn install --frozen-lockfile && yarn compile) reproduced the committed dist/
byte-for-byte, since #323/#325/#326/#327 each merged with their dist/ output.
Verified the dist/ files that chemotion_ELN's package_postinstall.sh patches by
path still carry exactly one const d3 = require('d3'); each, so ELN's install is
unaffected.

After merge (release execution — not in this PR)

1. Tag the merge commit v1.8.2 and push.
2. Create the GitHub Release for v1.8.2 → publish_package.yml builds dist + publishes @complat/react-spectra-editor@1.8.2 to npm.