fix: cross typos, detail below

What I did
Repository rules / “don’t edit” areas
From CONTRIBUTING.md and subprojects/README.md, subprojects/ contains vendored/submodule/copylib code (bubblewrap, libglnx, dbus-proxy, variant-schema-compiler). I treated subprojects/ as third-party and excluded it from typo fixing.

You already skip po/ (translations) and node_modules/, and I kept those exclusions.

Typos fixed (project-owned files only)
I ran codespell with write mode and exclusions, and fixed the reported typos across:

NEWS
app/…
common/…
doc/…
tests/…
session-helper/…
portal/…
data/…
Then I handled the remaining items individually:

NEWS: thse -> these
common/flatpak-utils-private.h: Thse -> These
app/flatpak-polkit-agent-text-listener.c: identies -> identities
tests/test-auth.sh: Propertly -> Properly
tests/testlibrary.c: remore -> remote
common/flatpak-transaction.c: improved wording to avoid the xwindows typo (X11 window ID)
Added .codespellrc
Created .codespellrc:

skip: node_modules,po,subprojects
ignore-regex: .*(ratatui|Affinitized|affinitized).*
ignore-words-list: nd,ot,THUR,IST,fo,hel,bu
(these were confirmed as legitimate tokens/abbreviations/namespace prefix/test strings in this repo, so they should not be “fixed”)
Verification:

codespell --config .codespellrc . now exits clean.

Signed-off-by: rezky_nightky <with.rezky@gmail.com>
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