Fix typos detected by codespell across codebase

[oxyzenQ]

This commit fixes various typos in source code and changelog files:

Source code fixes:

• Fix "defination" → "definition" in SrtFromTtmlWriterTest.java comment
• Fix "patter" → "pattern" in FilenameUtils.kt Javadoc

Configuration:

• Add .codespellrc for future typo checking, and file to exclude translation files (managed via Weblate) and add common false positives to ignore list

What is it?

• Bugfix (user facing)
• Feature (user facing) ⚠️ Your PR must target the refactor branch
• Codebase improvement (dev facing)
• Meta improvement to the project (dev facing)

Description of the changes in your PR

• Fix "defination" → "definition" in SrtFromTtmlWriterTest.java comment
• Fix "patter" → "pattern" in FilenameUtils.kt Javadoc
• Fix "swicthing" → "switching" in 5 changelog files (en-US, sk, pt, pt-PT, pt-BR)
• Fix "Anroid" → "Android" in 2 Hungarian changelogs (981, 986)
• Fix "creen" → "screen" in 13 changelog files (el, nl, pl, ru, pt-PT, be, sk, pt, en-US, pt-BR across versions 65, 66, 70)
• Fix "inclue" → "inclui" in pt-BR changelog 989
• Add .codespellrc configuration file for future typo checking (excludes translation files managed via Weblate)

Before/After Screenshots/Screen Record

• Before:
• After:
  N/A - No UI changes, only typo fixes in source code and changelogs.

Fixes the following issue(s)

• Fixes typos detected by codespell tool across the codebase

Relies on the following changes

N/A

APK testing

The APK can be found by going to the "Checks" tab below the title. On the left pane, click on "CI", scroll down to "artifacts" and click "app" to download the zip file which contains the debug APK of this PR. You can find more info and a video demonstration on this wiki page.

Due diligence

• I read the contribution guidelines.
• The proposed changes follow the AI policy.
• I tested the changes using an emulator or a physical device.

[theimpulson]

Please submit all your changes affecting file translations via weblate

[oxyzenQ]

Please submit all your changes affecting file translations via weblate

yo tunggu yo jek tak benerin.
wait bro still progressing fixing..