Update primary and accent colors to blue (#2563eb) matching landing page

[gugu]

Replace the dark charcoal (#212121) primary and purple (#C177FC) accent with the landing page's blue (#2563eb) for consistent branding.

[Copilot]

Pull request overview

This PR updates the application's primary and accent theme colors from dark charcoal (#212121) and purple (#C177FC) to a blue color (#2563eb) to match the landing page branding. The changes affect the central theme configuration and fallback values used when connections don't have custom colors defined.

Changes:

• Updated default theme colors in main.ts configuration
• Updated fallback theme colors in connections.service.ts for connections without custom branding

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
frontend/src/main.ts	Updated the default primaryPalette and accentedPalette from #212121 and #C177FC to #2563eb in the central theme configuration
frontend/src/app/services/connections.service.ts	Updated three instances of fallback theme colors to #2563eb when connections lack custom colors or properties

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[Copilot]

The color update is incomplete. While the primary theme colors have been changed to #2563eb, there are numerous hardcoded instances of the old colors throughout the codebase that have not been updated:

1. The old primary color #212121 appears in multiple CSS files (app.component.css, db-tables-list.component.css, and others) where it's used for backgrounds, borders, and text colors
2. The old accent color #C177FC appears in several places including saved-filters-dialog.component.css, company.component.html, and page-not-found.component.html
3. In db-tables-list.component.ts, #212121 is still used as the default folder icon color and in the folderIconColors array

For consistent branding as described in the PR, these additional occurrences should be evaluated and potentially updated as well. At minimum, the folder icon default color in db-tables-list.component.ts line 88 and the getFolderIconColor method (lines 366, 372, 376) should be reviewed since they specifically use the old primary color for UI elements.