polish(code-browse): file viewer + commit detail + new-repo + profile (parallel session 3.E)

polish(code-browse): file viewer + commit detail + new-repo + profile (parallel session 3.E)

Polishes 8 code-browse surfaces in src/routes/web.tsx to match the 2026
design language Agent A established on the repo-home (.repo-home-*),
issues, pulls, and dashboard surfaces:

  - GET /new — Hero with eyebrow + gradient display title "Spin up a
    repository", helper subtitle, polished visibility radio cards
    (public / private with descriptions), AI-native callout, animated
    orb, gradient hairline.

  - GET /:owner (profile) — Hero with gradient avatar, "Developer"
    eyebrow + "Joined Mon YYYY", gradient display name, handle, bio,
    follower/following/repo meta links, follow button. Profile README
    card chrome, repositories section head with count chip, empty
    state with "Create your first" CTA.

  - GET /:owner/:repo/tree/:ref{.+$} — Tree header row combining branch
    switcher + file/dir count + search pill, breadcrumb below.

  - GET /:owner/:repo/blob/:ref{.+$} — Polished file-header card with
    icon, name, KB-formatted size, line count, and Raw/Blame/History/
    Edit pills (Edit highlighted accent).

  - GET /:owner/:repo/commits/:ref? — Hero with count + branch chip,
    commit list wrapped in a card, branch switcher in toolbar.

  - GET /:owner/:repo/commit/:sha — High-impact polish. Card with SHA
    pill + verification badge in eyebrow, display title for subject,
    monospace body box for the long message, author/parents meta row,
    diff stats bar (files changed + additions/deletions colored),
    polished checks block.

  - GET /:owner/:repo/blame/:ref{.+$} — Polished blame header with
    icon, name, BLAME tag chip, line/contributor count, action pills.

  - GET /:owner/:repo/search — Hero with eyebrow + gradient title,
    search input with leading magnifier icon, results count head,
    file-grouped result cards with match-count chip, polished empty
    state.

All new CSS lives in a single shared `codeBrowseCss` constant injected
via `<style>` per handler, namespaced by surface prefix:
  .new-repo-*  .profile-*  .tree-*  .blob-*  .commits-*
  .commit-detail-*  .blame-*  .search-*

The .repo-home-* handler (GET /:owner/:repo) is untouched — Agent A's
session-2.A polish is preserved verbatim. No shared view files
(layout.tsx, components.tsx, ui.tsx) were modified. No logic, auth,
data-fetching, or routing behaviour changed — visual rendering only.

Tests: 2011 pass, 2 skip, 0 fail (unchanged from baseline). tsc clean.

https://claude.ai/code/session_01KdpgsaGpmEExJAz3yhFLvx