Add Flutter clean steps to repository cleanup

[calcitem]

Summary

• add Flutter clean and pubspec.lock removal to the clean script to clear Dart build artifacts
• guard Android keystore restoration with a trap and enable strict shell error handling

Testing

• ./format.sh s (fails: dart: command not found in environment)

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Codex Task

[github-actions]

@check-spelling-bot Report

🔴 Please review

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Unrecognized words (40)

Ctl
CXXFLAGS
deinitialize
depthext
edt
efmr
Espa
evals
ewt
fal
fmr
gameplay
ggerganov
ggml
glm
Hms
hpw
huggingface
imbalanced
kimi
mic
MMdd
moonshotai
movetime
nmove
nodiag
occ
puzzlename
Redownload
reinitialization
sid
STEB
subtag
Tagline
takeback
toremove
tru
utc
workaround
zhiqi

These words are not needed and should be removed

Blabla bmf NMove NOCOLOR SId Subtags

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... in a clone of the git@github.com:calcitem/Sanmill.git repository
on the codex/fix-flutter-build-failure-on-release branch (ℹ️ how do I use this?):

curl -s -S -L 'https://raw.githubusercontent.com/check-spelling/check-spelling/main/apply.pl' |
perl - 'https://github.com/calcitem/Sanmill/actions/runs/19534151129/attempts/1' &&
git commit -m 'Update check-spelling metadata'

OR

To have the bot accept them for you, comment in the PR quoting the following line:
@check-spelling-bot apply updates.

Forbidden patterns 🙅 (2)

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These forbidden patterns matched content:

s.b. into

\bin to\b

Pattern

\b[Nn]o[nt][- ]existent\b

Errors and Warnings ❌ (2)

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❌ Errors and Warnings	Count
❌ forbidden-pattern	2
⚠️ ignored-expect-variant	3

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Keystore-less runs now abort clean script

With set -e enabled earlier in the script, the new mv commands bail out when key.jks or key.properties are missing, which is the common case for contributors without Android signing keys. Previously the moves failed silently and the clean steps still ran; now the script exits before reaching git clean or the Flutter clean branch whenever those files are absent.

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