feat: add obisys crate for standardized CLI progress reporting

This commit introduces the `obisys` crate, which wraps `indicatif` to provide reusable `spinner` and `progress_bar` utilities with consistent styling and tick intervals. It refactors progress reporting across `obikindex`, `obikpartitionner`, and `obikmer` to use these shared functions, eliminating inline UI configuration and ensuring uniform terminal feedback.

src/obisys/Cargo.toml

@@ -4,5 +4,6 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-libc     = "0.2"
-sysinfo  = "0.33"
+libc      = "0.2"
+sysinfo   = "0.33"
+indicatif = "0.17"

src/obisys/src/lib.rs

@@ -1,5 +1,37 @@
 use std::fmt;
-use std::time::Instant;
+use std::time::{Duration, Instant};
+
+use indicatif::{ProgressBar, ProgressStyle};
+
+const BRAILLE: &[&str] = &["⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏"];
+
+/// Spinner with the standard project look: `⠋ label — msg  0s`.
+/// Caller updates the message with `pb.set_message(...)`.
+pub fn spinner(label: &str) -> ProgressBar {
+    let pb = ProgressBar::new_spinner();
+    pb.set_style(
+        ProgressStyle::with_template(&format!("{{spinner}} {label} — {{msg}}  {{elapsed}}"))
+            .unwrap()
+            .tick_strings(BRAILLE),
+    );
+    pb.enable_steady_tick(Duration::from_millis(100));
+    pb
+}
+
+/// Progress bar with the standard project look:
+/// `⠋ label — [████░░░░] pos/len unit  elapsed`.
+pub fn progress_bar(label: &str, n: u64, unit: &str) -> ProgressBar {
+    let pb = ProgressBar::new(n);
+    pb.set_style(
+        ProgressStyle::with_template(&format!(
+            "{{spinner}} {label} — {{bar:40.cyan/blue}} {{pos}}/{{len}} {unit}  {{elapsed}}"
+        ))
+        .unwrap()
+        .tick_strings(BRAILLE),
+    );
+    pb.enable_steady_tick(Duration::from_millis(100));
+    pb
+}
 
 use libc::{RUSAGE_SELF, getrusage, rusage, timeval};
 use sysinfo::System;