[kzryzstof]

Summary

Streamers currently only find out about achievement unlocks, game changes, and full mastery — progress on a still-locked achievement (e.g. a measured achievement climbing from 3/10 to 5/10) goes unannounced. This adds progress as a fourth, independently-configurable announcement type so viewers can follow along as progress is made, not just when something finally unlocks.

Changes

• Add announce_progress and progress_announcement_template to twitch_configuration_t, with a default template and persistence in state.c/state.h
• Diff each still-locked achievement's measured_progress against the previous snapshot in achievement_announcer.c and post a Twitch chat message (via the same throttled, only_when_live-aware posting path as the other announcement types) when it changes, supporting {name}, {progress}, and {gamertag} placeholders
• Add a "Progress Announcements" section (checkbox + template field) to the Twitch Account dialog, widen the dialog (460px → 620px), and fix the placeholder-help labels wrapping onto two lines
• Correct the measured_progress doc comment on achievement_t — it's populated for Xbox achievements with non-zero progression too, not just RetroAchievements

Related

• PL-81

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