feat: add in-app help/FAQ system

[boalambo]

• Add floating help button in bottom-right corner
• Implement help overlay with search and FAQ categories
• Add 16 FAQ entries across 4 categories (Getting Started, Stellar Specifics, Privacy, Troubleshooting)
• Implement context-awareness for Send/Receive pages
• Add full accessibility support (focus trap, Esc to close, ARIA labels)
• Content lives in src/help/faq.ts as typed array for easy translation

Closes #22

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[boalambo]

hello maintainer, kindly check I am waiting for approval since. Thank you

[truthixify]

Help button + overlay + 159-line FAQ are the right shape for #22. Rebase needed, your branch is from pre-develop main and diff reverts recently-merged work in StellarSend/Receive.

git fetch origin
git rebase origin/develop
git push --force-with-lease

Keep HelpButton.tsx, HelpOverlay.tsx, faq.ts, and the App.tsx mount; drop your changes to StellarSend/Receive (they were just unintended reverts from the stale base). Thanks @boalambo.

[boalambo]

Help button + overlay + 159-line FAQ are the right shape for #22. Rebase needed, your branch is from pre-develop main and diff reverts recently-merged work in StellarSend/Receive.

git fetch origin
git rebase origin/develop
git push --force-with-lease

Keep HelpButton.tsx, HelpOverlay.tsx, faq.ts, and the App.tsx mount; drop your changes to StellarSend/Receive (they were just unintended reverts from the stale base). Thanks @boalambo.

Rebased onto the latest develop and force-pushed the branch. Verified the PR diff now only contains App.tsx, HelpButton.tsx, HelpOverlay.tsx, and faq.ts as intended.

[truthixify]

Rebase looks clean, the diff is just your 4 additions now. 16 FAQ entries covering getting-started, Stellar specifics, privacy, troubleshooting. Merging. Thanks @boalambo.