pl: fix five speech/navigation defects and catch up with recent en changes

[michaldziwisz]

Summary

Five independent fixes to the Polish localization. Three catch up with recent
changes to the English rule files; two fix defects that predate them.

Each commit is self-contained and can be reviewed on its own.

1. Up tack spoken as perpendicular (6d0aaed9)

Follow-up to 45aefb2. Editors commonly emit U+22A5 where perpendicularity is
meant, so both U+27C2 and U+22A5 now say "jest prostopadle do", while
LiteralSpeak keeps reading U+22A5 literally. Previously Polish said "dol" for
U+22A5, so the same formula was read differently in Polish than in English.

2. The | argument-glue syntax (92cfaf9b)

Follow-up to 4347d88. Several intents lost their function name in speech:

intent	before	after
quotient	podzielone przez z x przecinek, y	czesc calkowita z x podzielone przez y
remainder	podzielone przez z x przecinek, y	reszta z x podzielone przez y
set-difference	i z wielka a przecinek, wielka b	roznica zbiorow z wielka a i wielka b
polar-coordinate	przecinek z x przecinek, y	wspolrzedna biegunowa z x przecinek, y

Adopting the syntax in definitions.yaml alone was not enough: the
function-intent rule has to call IntentFunctionUseArityPath /
IntentFunctionGlueBefore, which only en and hu did. That rule is now
ported to pl.

Also fixes SharedRules/geometry.yaml, where the coordinate rule matched "."
instead of not(*[@arg]) and so swallowed coordinate($x,...) intents that
should fall through to IntentMappings; its name was mistranslated as "przecinek"
(comma) rather than "punkt" (point). Adds the missing empty-set, and orders
transpose fixities as en does.

Not adopted: arity templates (| po | od,do) for sum/product — see the
issue linked below.

3. Navigation direction words (1fe33293)

This is the most user-visible one, and it is not just a port.

navigate.yaml compared the suffix of $NavCommand — always English, e.g.
ZoomIn — against a substring offset by the length of the spoken $Prefix.
For English those lengths coincide; for any translation they do not:

ZoomIn        -> ""          (want "In")     "przybliz" is 8 chars, "Zoom" is 4
ZoomOutAll    -> "ll"        (want "OutAll")
MoveNext      -> "t"         (want "Next")
DescribeNext  -> "ibeNext"   (want "Next")

All 16 branches were dead, so users heard "przejdz; do mianownika" with no
direction, never "przejdz w prawo". $CommandOffset, introduced in ec36e05,
fixes all of them.

Polish also needs two verbs where English reuses "zoom": "przybliz na zewnatrz"
(zoom in outwards) is self-contradictory, so ZoomOut* now says "oddal" and the
direction word is dropped for plain In/Out, as the verb already carries it.

Ports into-or-out-of-prefix-or-silent-without-parts (080ca16) and the
SpeakIntentName fallbacks, keeping the Polish preposition logic.

4. Table column and row separators (3cf59ebc)

Follow-up to fbc49bb. The HasVisibleColumnLine / HasVisibleRowLine rules
were missing from pl, so visible lines were silent and an augmented matrix was
read exactly like a plain one. Two existing Polish tests were pinning the
pre-#679 output; their English counterparts already expect "separator", so they
are updated rather than worked around.

5. Remaining untranslated unicode entries (3ca7fac5)

The audit tool reported 81 unicode entries whose text equals the English source.
Reviewing them one by one, only two were actually untranslated: U+2127
mhos -> mho (as nb and sv have it) and U+2644 Saturn, whose Polish
spelling is the same. The other 79 are correct as-is and only needed the
verified key: 30 Roman numerals spelled out letter by letter, 29 space/PUA/
zero-width entries with no speech, 6 typographic ligatures, and proper names
such as spesmilos, paragraphos and digamma.

Audit's "untranslated" count for the unicode files: 81 -> 0.

Test plan

cargo test --test languages Languages::pl     607 -> 609 passed, 0 failed
cargo test --lib                              320 passed, 0 failed
cargo test --test languages (all languages)  4946 passed, 0 failed
uv run --project PythonScripts audit-translations pl

Adds four tests: up_tack_330, zoom_speech_pl, move_char_speech_pl,
dashed_augmented_matrix_separator, matrix_row_separator.

Each new test was checked for discrimination by reverting the corresponding fix:
with the old offset formula both navigation tests fail showing the missing
direction word, and removing either separator rule fails all four matrix tests.

src/navigate.rs gains only test code; no engine logic is touched.