French adaptive accent key on AZERTY (apostrophe/accent based on context)

[Pivii]

Context

iOS AZERTY row 3 has an adaptive key (FrenchAdaptiveKey namespace, refactored in v1.6.2): its label changes based on the preceding text — shows the most likely accent after a vowel (é after e…), apostrophe after consonant contexts like "qu". Long-press shows all variants. Android AZERTY currently has a static apostrophe key in row 3.

What to do

• Port the FrenchAdaptiveKey decision rules (read context via InputConnection.getTextBeforeCursor)
• Update the key label reactively as the user types
• Long-press → full accent variant popup (existing AccentPopup)
• French/AZERTY only (explicitly scoped, like iOS)

Acceptance criteria

• Key shows contextually correct character (parity with iOS rules)
• No lag on label updates while typing fast
• Other layouts/languages unaffected

iOS reference: FrenchAdaptiveKey in DictusCore (v1.6.2 refactor notes).