fix popup cmd a select all for #1395

[Chapoly1305]

Root cause was missing event wiring: the popup textarea’s keydown handler (getOnTextAreaCopy) was no longer attached after refactor, so Cmd/Ctrl+A logic in that handler never ran. metaKey detection itself was fine; it just wasn’t being invoked in the popup textarea. getOnTextAreaCopy(...) centralizes Cmd/Ctrl+A/C/X behavior in one place.
It avoids duplicating shortcut logic across multiple inline listeners.

Test results: now user able to use select all in the pop-up, as well as copy, cut, etc. Concat feature works as before, not affected by this fix.

[Copilot]

Pull request overview

Fixes missing popup textarea keyboard shortcut handling so Cmd/Ctrl+A/C/X work again in the reader selection popup (regression from refactor), while also making concat-modifier tracking reflect the actual modifier-pressed state.

Changes:

• Re-attaches the popup textarea keydown handler via getOnTextAreaCopy(...) so select-all/copy/cut shortcuts run.
• Refactors concat-modifier tracking to use ev.metaKey/ev.ctrlKey state rather than only reacting to modifier keydown.
• Minor inline handler tweak in standalone.xhtml (window.close()).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/modules/shortcuts.ts	Tracks concat modifier using metaKey/ctrlKey state on keydown/keyup.
src/modules/popup.ts	Wires keydown listener for popup textarea to restore Cmd/Ctrl+A/C/X behavior.
addon/chrome/content/standalone.xhtml	Small inline handler change for close command.

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[github-actions]

@Chapoly1305
I automatically applied lint fixes but couldn’t push to your branch—could you please run:

npm run lint

and push the results? Thanks!

[github-actions]

@Chapoly1305
I automatically applied lint fixes but couldn’t push to your branch—could you please run:

npm run lint

and push the results? Thanks!

[github-actions]

@Chapoly1305
I automatically applied lint fixes but couldn’t push to your branch—could you please run:

npm run lint

and push the results? Thanks!

[Chapoly1305]

Test passed on MacOS,

1. Cmd+A/C/X works on pop-up
2. Concat works was expected.