Unify integration icons on one component

[RhysSullivan]

The "Add an integration" browse page rendered a bare-letter avatar for Codex
plugin presets: its private RowIcon fed the preset's authenticated
executor: icon path into a raw <img> (which can never load it) and never
consulted the preset's public fallback image. The command palette had its own
separate component that did this correctly — two resolvers for the same icon.

• IntegrationFavicon is now the one canonical component: explicit icon
  (including executor:-scheme paths resolved through the authenticated local
  API) → explicit fallback image → bundled local icon → favicon derived from
  the integration URL → neutral BoxIcon. Gains fallbackSrc and
  className.
• The browse page's three row kinds (presets, registry, installed), the
  command palette, and the Codex plugin add screen all render through it.
  RowIcon and PresetIcon are deleted.
• The installed rows' hand-rolled copy of the cascade is gone with them.

e2e: the Codex plugins scenario now opens the browse page in a real browser
and asserts the Computer Use card shows its product icon.

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