splash_screen uses epdlib text_fit; test that no sample text is cut (M7)

[txoof-bot]

Closes #249

What changed

splash_screen tries several ways of breaking an address (after a "/", then after ".", "-" or ":") until one is drawn whole. Each try was checked by calling epdlib's internal text.fit_text with the block's settings copied by hand (font, size, width, height, max_lines, shrink, ellipsis). Now each try is one call to epdlib's new prepared.text_fit(name, option) (txoof/epdlib#91), which uses the block's real settings, so the check can't drift from what epdlib draws.

• fit_address(prepared, name, address) replaces fit_address(address, font, size, width, height, max_lines, ellipsis). The quick check that skips tries too wide even at the smallest size stays (it keeps long names fast).
• The test "addresses always appear whole" uses text_fit too, instead of its own copy of the block's settings and padding sum.
• Same tries in the same order: no picture changed (all reference images match).
• New test in tests/test_all_plugins.py (txoof asked for a few cases, not every layout): each plugin's default layout, drawn with its sample data on a 9.7" (1200x825) and a 2.7" (264x176) screen, must not cut any text with "…". Text made smaller by shrink is allowed. 22 cases; all pass today. Checked that it fails with a too-long sample hostname.
• epdlib pin moved from 4633fca to 8789b4d (the Updates RGB support and Waveshare Drivers #91 merge). Only the pin changes in pyproject.toml and uv.lock.

Area

plugins/splash_screen, ci (epdlib pin only), tests.

Tests

• uv run pytest passes (1330 passed; reference images unchanged)
• uv run ruff check . passes
• Hardware tests: not needed, no display or driver code changed.

Review

• Review agents' comments answered — not run: small change (+56/−38).

Only txoof approves and merges this PR.

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