Refresh Telos branding and explorer UI

[TheJudii]

Summary

• Adds current Telos/Telos Zero brand assets, Silka font assets, and shared Telos theme tokens.
• Refreshes the explorer header, home/network surfaces, transaction tables, wallet/account dialogs, resource/staking dialogs, footer, map styling, and accessibility-related link/input/button contrast.
• Updates Telos price-chart handling with provider fallbacks and safer rendering when market data is missing.
• Filters the BP map data to active on-chain producers so stale producers from the S3 report are not shown.

User impact

• The Telos explorer UI aligns more closely with the current Telos brand system while retaining the existing app structure.
• Links, form fields, account actions, and transaction controls have improved contrast and clearer affordances.
• The network price chart is less likely to render empty and now degrades gracefully when providers fail.
• The producer map avoids displaying inactive/nonexistent BPs.

Validation

• git diff --check
• yarn lint passed with 6 existing unused-variable warnings in test files.
• yarn test test/jest/__tests__/components/PriceChart.spec.ts --runInBand
• Browser spot checks on account, network, staking/resource/send dialog, transaction table, chart, and map surfaces during the iteration.

Known validation note

• yarn build is currently blocked in this local environment before app compilation by the existing Quasar CLI/runtime dependency combination: @quasar/app-webpack calls require('pretty-error').start(), while the existing lockfile resolves pretty-error@4.0.0, which no longer exposes .start() under Node 22. This PR does not include an unrelated dependency pin for that existing build-tool issue.

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