fix(dashboard): refine capability and welcome styling

[Soulter]

What changed

• remove the custom capability source chip component and its two consumers
• remove the now-unused source label/tone helpers
• replace the welcome cards' themed border prop with a subtle neutral border

Why

The capability chips introduced inconsistent teal accents in dark mode, while the welcome card border inherited an overly prominent themed color. This keeps the affected surfaces visually neutral and consistent.

Impact

Capability lists no longer display source badges. Welcome cards retain their rounded layout with a subtle neutral outline.

Validation

• pnpm typecheck
• uv run ruff format --check .
• uv run ruff check .
• git diff --check

Summary by Sourcery

Remove capability source badges from capability lists and neutralize welcome card borders to simplify and unify dashboard styling.

Bug Fixes:

• Eliminate inconsistent teal accents in dark mode by removing capability source chips and themed welcome card borders.

Enhancements:

• Remove the CapabilitySourceChip component and its related source label/tone helpers now that source badges are no longer displayed.
• Apply a subtle, neutral border to welcome cards while preserving their rounded layout.

[dosubot]

📄 Knowledge review

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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