Prepare release v0.7.0

[JumpLink]

Prepares the v0.7.0 release. 🎉

Release highlights

• Hebrew translation — fully (100%) contributed by Menachem (@naattxx). Toda raba! 🙏
• Right-to-left support — Hebrew is our first RTL language. Thanks to @naattxx's thorough testing, feedback and contributions, the app now properly supports right-to-left layouts, which also prepares it for other RTL languages such as Arabic or Persian.
• Indonesian translation — fully contributed by Arif Budiman (@arifpedia). Terima kasih!
• Many small fixes and improvements (debugger stepping, message console output, editor polish).

What's in this PR

• Bump version to 0.7.0 (meson, all package.json files)
• Add release notes for v0.7.0 to gjsify.flatpak.releases and regenerate metainfo.xml.in via yarn flatpak:regen
• Update the .pot template and translate the new release-note strings into all 15 languages (.po files, Android i18n JSON, translated metainfo.xml)
• Add Polish, Finnish, Hebrew and Indonesian to the language credits table in the translations README

Draft for the GitHub release (after merge + tag)

## What's Changed

### Shalom! Hebrew translation & right-to-left support 🇮🇱

* Learn 6502 Assembly is now available in Hebrew, fully (100%) translated by Menachem (@naattxx). Toda raba! 🙏
* Hebrew is our first right-to-left language: thanks to @naattxx's testing, feedback and contributions, the app now supports RTL layouts — and is prepared for more RTL languages like Arabic and Persian:
  * Gamepad/d-pad no longer mirrors in RTL (#107, #112, #137)
  * Tutorial and code views handle RTL text correctly (#111, #121, #125, #126, #135)

### Selamat datang! Indonesian translation 🇮🇩

* Indonesian translation, fully contributed by Arif Budiman (@arifpedia). Terima kasih!

### Fixes & improvements

* The debugger no longer steps past the end of a completed program (#115)
* Message console: non-ASCII text (#120), unreplaced placeholders (#123), translatable dump headings (#127), cleaner logging (#133)
* Editor: cursor line is only highlighted while editing (#132), run toolbar stays anchored to the editor column (#134)

### Under the hood

* Build system migrated to the gjsify toolchain (#90, #91, #96, #97, #100, #101, #102)
* Node 26 support (#114), CI improvements (#98, #105), dependency updates (#103)

**Full Changelog**: https://github.com/JumpLink/Learn6502/compare/v0.6.5...v0.7.0