feat(web): show current-provider usage in the chat box

[Aditya190803]

Stacked on #1732. Adds opt-in remaining session/weekly usage for the current thread's provider next to the chat box.

• Off by default: Settings → General → Show usage in chat
• Hidden on a new thread until the first message is sent
• Codex thread shows Codex only; switching providers switches the meter
• If a context-window ring is visible, the bars live in that hover (not mixed into the ring number)
• If there is no ring after a turn, a compact percent control appears next to send
• Providers without a usable quota snapshot hide the meter

Settings (opt-in, default off)

Chat box hover after a turn

Test plan

• Toggle remains off by default; empty new thread does not show a percent next to send
• After enabling the setting and sending a message, context-window hover shows Usage bars for the current provider
• Switching the thread's provider switches the meter; providers without quota hide it

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