Apply the copy and layout trims from the 1 Oct client review

[laveshparyani]

Changes the client walked through on the 1 Oct call. All of them are removals
or re-weightings — no new surface.

Copy

• Drop "Architectural & Design Consultancy" from the hero eyebrow and from
  under the footer wordmark. He called it "collaborative designs" on the call;
  the recording confirms he was pointing at this line.
• Footer Instagram is now the icon alone, enlarged (15px → 26px). The handle
  moves to aria-label so the link is still announced, and it gets a 44px hit
  area now that there is no text to click.

Contact affordances

• Add Instagram to the header, beside Enquire. It stays visible below 620px
  where .nav__cta is hidden — the practice's first enquiry arrived through the
  profile, so it should not be the thing that drops on a phone.
• Remove the inline phone beside "Start a project" in the hero and in the
  CTA band. The floating Call button already covers that intent, and it carries
  both numbers.
• Contact page: the two numbers were inline-flex with a size step between
  them, so they ran onto one line and collided. They now stack at one size.
  Both numbers stay published, equally — the client was explicit about that, and
  the --alt modifier is gone entirely so there is no variant left to drift.

Layout

• Footer columns: auto-fit split the row evenly and left Contact ~204px,
  just under what kalapritidesigns@gmail.com needs, so it broke mid-word.
  Weighted the columns so the width goes to the one that uses it. Follow is now
  a single icon plus a short link, so it had room to give.

Verification

• npm run lint and npm run build clean.
• Checked the minified CSS, not just the source: the five dead rules are
  gone, the new ones survive, and the 821px rule is still scoped to its media
  query (LightningCSS rewrites it to width>=821px).
• Contact numbers measured in the DOM — identical font-size, font-family,
  font-weight, color, icon size, gap and height; stacked 6px apart.
• Zero horizontal overflow at 375px. No console or server errors.