Show context usage percentage in the status bar

Feature Request

It would be very helpful to show the context window usage percentage in the bottom status bar (next to "accept edits on").

Why

• Currently the only way to check context usage is by typing /context
• Having it always visible helps users manage long conversations
• Prevents surprise context limits mid-conversation
• Similar to how IDEs show memory usage in their status bars

Suggested Implementation

• Add a small indicator like Context: 46% or a progress bar in the bottom status bar
• Update it after each message exchange
• Optionally change color when nearing limits (e.g. yellow at 70%, red at 90%)

Current Workaround

• Manually typing /context every time, which interrupts workflow

This would be a small but very useful quality-of-life improvement for power users who run long sessions.