chore: Align auth page with CLI icon

[amix]

Context

The auth callback page used teal accents and the inline SVG logo could render too blue because its blend modes interacted with the page backdrop.

What was changed

• Align success page accents with the CLI icon lavender and ink palette.
• Isolate the inline SVG logo so its blend modes render against the icon container.

[doistbot]

Thanks Amir for updating the auth callback page styling to align with the CLI icon palette and fixing the SVG blend modes 🤗. No issues were flagged.

I also included a few optional follow-up notes in the details below.

Optional follow-up notes (2)

• [P3] src/lib/auth-pages.ts:174: These new palette literals duplicate the fills already hardcoded inside COMMS_CLI_ICON_SVG, which is how this page ended up drifting from the icon in the first place. Hoist the ink/lavender values into module-level constants and interpolate them into both the SVG string and the page CSS so future palette changes stay aligned.
• [P3] src/lib/auth-pages.ts:230: This PR fixes a specific rendering regression by isolating the logo container, but the nearby auth login wiring test still only checks the page copy. Since src/commands/auth/auth.test.ts already calls both options.renderSuccess() and options.renderError(), add a regression assertion that the generated HTML includes the logo isolation rule (and the matching error-page change) so a future style cleanup doesn't silently bring back the blend-mode color shift.

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[doist-release-bot]

🎉 This PR is included in version 1.5.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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