Refactor/styles separate css

[SharonStrats]

Followed contacts-pane and profile pane to move styles into css files. Also copied over the dev globals for the development environment.

[Copilot]

Pull request overview

This PR refactors UI styling by moving inline styles into dedicated CSS files and updates the webpack build/dev setup to bundle CSS, aligning this pane with patterns used in other panes (contacts/profile) and adding local-development global styles.

Changes:

• Introduced shared webpack moduleRules (including CSS + CSS modules handling) and wired it into both prod and dev webpack configs.
• Replaced multiple inline style assignments with semantic class names and new CSS files across tracker/issue/board UI.
• Updated development environment defaults (dev global CSS overrides, Node version guidance via .nvmrc/README, package metadata).

Reviewed changes

Copilot reviewed 18 out of 20 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
webpack.module.rules.mjs	New shared webpack module rules, including CSS handling.
webpack.dev.config.mjs	Uses shared moduleRules instead of local duplication.
webpack.config.mjs	Uses shared moduleRules for production builds.
package.json	Marks CSS as side-effectful and adds loaders / Node engine constraint.
.nvmrc	Updates the Node version used for development.
README.md	Adds development setup instructions (Node + start commands).
dev/index.js	Imports dev-global CSS and changes default dev tracker URL.
dev/dev-global.css	Adds local-dev global styling variables/resets and accessibility-focused defaults.
src/newTracker.js	Replaces inline styling with a CSS class and imports the stylesheet.
src/newIssue.js	Adds CSS import, replaces innerHTML with DOM construction, and adds close/cancel behavior.
src/issuePane.js	Imports CSS and replaces inline styles with classes (board/table/new issue/overlay/login button).
src/issue.js	Imports CSS and replaces many inline styles with classes; adjusts overlay structure.
src/board.js	Imports CSS and replaces inline styles with classes for board/table/cards.
src/styles/newTracker.css	New CSS for tracker creation button spacing.
src/styles/newIssue.css	New CSS for new issue form/title input styling.
src/styles/issuePane.css	New CSS for issue pane controls and overlay container.
src/styles/issue.css	New CSS for issue overlay/panel and related subcomponents.
src/styles/board.css	New CSS for board/table/card layout.
src/styles/csvButton.css	Added (currently empty).

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[SharonStrats]

I'll have to check this in the morning bc it's not like that in my code and it says my code is up to date. a bit weird.