[lenny] fix(mobile): Linux-rendered goldens + SDK font case

[mfethe1]

Fixes the 8 mobile golden failures.

Two faults, both required:

1. golden_shot.dart hardcoded lowercase SDK font filenames (materialicons-regular.otf). macOS is case-insensitive so it resolved; Linux CI is case-sensitive and threw Bad state: cannot register font family "MaterialIcons", aborting before any image was compared. (Same fix as test(mobile): match SDK font filename case #23.)
2. With the crash cleared, the real diff surfaced: goldens were macOS-rendered — Pixel test failed, 1.32%, 4348px diff.

Evidence: regenerated on ubuntu-latest with hermit-pinned Flutter 3.41.7 in run 34626327474 — Regenerate goldens ✓ and Verify goldens now pass unmodified ✓. Committed blobs verified byte-identical to the run's linux-goldens artifact. Temporary regen workflow removed.

Supersedes #23 (which fixes only fault 1).

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[mfethe1]

Merging with documented baseline exception (approved by repo owner).

What this PR fixes: Clients / Mobile went from 2241 passed / 8 failed to 🎉 2249 tests passed, 0 failed — verified green on this head. Two distinct faults were required: SDK font-filename casing in golden_shot.dart (crash before any image was written) and macOS-rendered goldens replaced with Linux-rendered ones.

Remaining reds are pre-existing on product/main, reproducing identically in runs 34628362226, 34625409103, 34621827840, 34621807801:

• Desktop Domain / Desktop Smoke E2E (3) and (4) — shards (1) and (2) pass on both trunk and this branch
• Desktop, Desktop Domain / Desktop — roll-up gates over the above

Failing set on this branch == failing set on trunk; no diff-scope failure remains.