feat: Add md text-editor and support for image upload

[CrawlerCode]

• Settings for redmine text-formatting with auto-detect
• Markdown text-editor
• Converting md to textile
• Support for image upload

[Copilot]

Pull request overview

This PR adds Markdown editing capabilities and Redmine text-formatting awareness to the extension, along with initial support for uploading/attaching files (notably images) when editing issue descriptions/notes and creating time entries.

Changes:

• Introduces a Markdown editor field component (with preview/fullscreen, toolbar commands, and paste-to-upload for images).
• Adds Redmine instance settings for text formatting (auto-detection + persisted settings).
• Adds attachment upload plumbing (API client, UI components, and new “uploads” fields on issue/note/time-entry flows).

Reviewed changes

Copilot reviewed 20 out of 21 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
wxt.config.ts	Adds a build-time ASCII-output workaround plugin for the content script bundle.
src/utils/markdownToTextile.ts	Adds Markdown→Textile conversion helper for Textile-configured Redmine instances.
src/routes/settings.tsx	Adds Redmine settings UI + auto-detection of text-formatting.
src/provider/SettingsProvider.tsx	Persists new redmine.settings.textFormatting setting with defaults/schema.
src/lang/en.json	Adds i18n strings for uploads field + editor toolbar + Redmine settings.
src/lang/de.json	Adds i18n strings for uploads field + editor toolbar + Redmine settings.
src/lang/fr.json	Adds i18n strings for uploads field + editor toolbar + Redmine settings.
src/lang/ru.json	Adds i18n strings for uploads field + editor toolbar + Redmine settings.
src/index.css	Adds styling overrides for the Markdown editor (theme variables, lists).
src/hooks/useAppForm.ts	Registers RedmineMdEditorField in the app form hook.
src/components/ui/chart.tsx	Minor Tailwind class refactors (size utilities/order).
src/components/ui/attachment.tsx	Adds reusable attachment UI primitives.
src/components/time-entry/CreateTimeEntryModal.tsx	Adds Markdown editor for notes + uploads field + upload mutation.
src/components/issue/form/IssueForm.tsx	Adds uploads to issue create/edit schema + upload mutation + uploads field.
src/components/issue/form/fields/UploadsField.tsx	Adds uploads list UI with remove action.
src/components/issue/AddIssueNotesModal.tsx	Adds Markdown editor for notes + uploads field + upload mutation + Textile conversion.
src/components/form/RedmineMdEditorField.tsx	New Markdown editor field with toolbar, preview/fullscreen, paste image upload, and URL transforms.
src/api/redmine/types.ts	Adds attachment/upload-related API types and extends issue types.
src/api/redmine/RedmineApiClient.ts	Adds attachment upload/remove methods and text-format detection; includes attachments in issue fetch.
package.json	Adds @uiw/react-md-editor and react-reverse-portal dependencies.
pnpm-lock.yaml	Locks new dependencies and their transitive tree.

Files not reviewed (1)

• pnpm-lock.yaml: Generated file

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